[gnome-tetravex] Fix typos.

[Arnaud B. <arnaudb src gnome org>]

commit d76488cb6e23aa6bd568079ceb0d39233a012666
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Jun 13 20:39:22 2020 +0200

    Fix typos.
    
    Found by [Codespell](https://github.com/codespell-project/codespell).

 data/org.gnome.Tetravex.appdata.xml.in | 2 +-
 src/gnome-tetravex.vala                | 8 ++++----
 src/puzzle-view.vala                   | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/data/org.gnome.Tetravex.appdata.xml.in b/data/org.gnome.Tetravex.appdata.xml.in
index 6de44ec..72c9f89 100644
--- a/data/org.gnome.Tetravex.appdata.xml.in
+++ b/data/org.gnome.Tetravex.appdata.xml.in
@@ -70,7 +70,7 @@
   </content_rating>
 
   ​<releases>
-    <!-- should be kept in versionning inverted order -->
+    <!-- should be kept in versioning inverted order -->
   ​  <release version="3.37.1" date="2020-04-25" type="development" urgency="low"/>
     <release version="3.36.2" date="2020-04-25" type="stable" urgency="medium"/>
   </releases>
diff --git a/src/gnome-tetravex.vala b/src/gnome-tetravex.vala
index b6d70d4..985b672 100644
--- a/src/gnome-tetravex.vala
+++ b/src/gnome-tetravex.vala
@@ -199,13 +199,13 @@ private class Tetravex : Gtk.Application
                 /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
description of the action of the “--cli A1b2” command */
                     + "\n" + "  --cli A1b2    " + _("Invert two tiles, the one in A1, and the one in b2.")
 
-                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explaination of the behavior of the “--cli A1b2” command; the meanings of a lowercase and of the digits are 
explained after */
+                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explanation of the behavior of the “--cli A1b2” command; the meanings of a lowercase and of the digits are 
explained after */
                     + "\n" + "                " + _("An uppercase targets a tile from the initial board.")
 
-                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explaination of the behavior of the “--cli A1b2” command; the meanings of an uppercase and of the digits are 
explained before and after */
+                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explanation of the behavior of the “--cli A1b2” command; the meanings of an uppercase and of the digits are 
explained before and after */
                     + "\n" + "                " + _("A lowercase targets a tile in the left/final board.")
 
-                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explaination of the behavior of the “--cli A1b2” command; the meanings of uppercases and lowercases are 
explained before */
+                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explanation of the behavior of the “--cli A1b2” command; the meanings of uppercases and lowercases are 
explained before */
                     + "\n" + "                " + _("Digits specify the rows of the two tiles to invert.")
                     + "\n"
                 /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
description of the action of the “--cli” or “--cli show” or “--cli status” commands */
@@ -220,7 +220,7 @@ private class Tetravex : Gtk.Application
                 /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
description of the action of the “--cli finish” or “--cli end” commands */
                     + "\n" + "  --cli finish  " + _("Finish current puzzle, automatically. Alias: “end”.")
 
-                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explaination of the behavior of the “--cli finish” command; the command does something in two situations: if 
the puzzle has been solved in the right part of the board, and if there is only one tile remaining (“left”) 
on the right part of the board that could be moved automatically */
+                /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
explanation of the behavior of the “--cli finish” command; the command does something in two situations: if 
the puzzle has been solved in the right part of the board, and if there is only one tile remaining (“left”) 
on the right part of the board that could be moved automatically */
                     + "\n" + "                " + _("Works for puzzles solved right or if one tile left.")
                     + "\n"
                 /* Translators: command-line help message, seen when running `gnome-tetravex --cli help`; 
description of the action of the “--cli up” command */
diff --git a/src/puzzle-view.vala b/src/puzzle-view.vala
index 4d75d6f..7592ee8 100644
--- a/src/puzzle-view.vala
+++ b/src/puzzle-view.vala
@@ -47,14 +47,14 @@ private class PuzzleView : Gtk.DrawingArea
         internal double x = 0.0;
         internal double y = 0.0;
 
-        /* Co-ordinates to move from */
+        /* Coordinates to move from */
         internal double source_x = 0.0;
         internal double source_y = 0.0;
 
         /* Time started moving */
         internal double source_time = 0.0;
 
-        /* Co-ordinates to target for */
+        /* Coordinates to target for */
         internal double target_x = 0.0;
         internal double target_y = 0.0;