[valadoc] docs: Clarify SGR as Select Graphic Rendition

[Rico Tzschichholz <ricotz src gnome org>]

commit 863e080da6eff4c3dbac108f83d7b55a9aa97f13
Author: Alistair Thomas <astavale yahoo co uk>
Date:   Wed Sep 6 11:03:19 2017 +0100

    docs: Clarify SGR as Select Graphic Rendition

 src/libvaladoc/errorreporter.vala |   26 +++++++++++++-------------
 1 files changed, 13 insertions(+), 13 deletions(-)
---
diff --git a/src/libvaladoc/errorreporter.vala b/src/libvaladoc/errorreporter.vala
index 5b9543e..ec51aad 100644
--- a/src/libvaladoc/errorreporter.vala
+++ b/src/libvaladoc/errorreporter.vala
@@ -28,67 +28,67 @@ public class Valadoc.ErrorReporter : Object {
        private int _errors = 0;
 
        /**
-        * SGR end tag
+        * SGR (Select Graphic Rendition) end tag
         */
        private const string ANSI_COLOR_END = "\x1b[0m";
 
        /**
-        * SGR start tag for source location
+        * SGR (Select Graphic Rendition) start tag for source location
         */
        private string locus_color_start = "";
 
        /**
-        * SGR end tag for source location
+        * SGR (Select Graphic Rendition) end tag for source location
         */
        private unowned string locus_color_end = "";
 
        /**
-        * SGR start tag for warning titles
+        * SGR (Select Graphic Rendition) start tag for warning titles
         */
        private string warning_color_start = "";
 
        /**
-        * SGR end tag for warning titles
+        * SGR (Select Graphic Rendition) end tag for warning titles
         */
        private unowned string warning_color_end = "";
 
        /**
-        * SGR start tag for error titles
+        * SGR (Select Graphic Rendition) start tag for error titles
         */
        private string error_color_start = "";
 
        /**
-        * SGR end tag for error titles
+        * SGR (Select Graphic Rendition) end tag for error titles
         */
        private unowned string error_color_end = "";
 
        /**
-        * SGR start tag for note titles
+        * SGR (Select Graphic Rendition) start tag for note titles
         */
        private string note_color_start = "";
 
        /**
-        * SGR end tag for note titles
+        * SGR (Select Graphic Rendition) end tag for note titles
         */
        private unowned string note_color_end = "";
 
        /**
-        * SGR start tag for caret line (^^^)
+        * SGR (Select Graphic Rendition) start tag for caret line (^^^)
         */
        private string caret_color_start = "";
 
        /**
-        * SGR end tag for caret line (^^^)
+        * SGR (Select Graphic Rendition) end tag for caret line (^^^)
         */
        private unowned string caret_color_end = "";
 
        /**
-        * SGR start tag for quotes line ('', ``, `')
+        * SGR (Select Graphic Rendition) start tag for quotes line ('...', `...`, `...')
         */
        private string quote_color_start = "";
 
        /**
-        * SGR end tag for quotes line ('', ``, `')
+        * SGR (Select Graphic Rendition) end tag for quotes line ('...', `...`, `...')
         */
        private unowned string quote_color_end = "";