[gnome-terminal] help: Fix various grammar issues and missing words

[Christian Kirbach <ckirbach src gnome org>]

commit a2bb902afcfbfd320d14c114a6731456dcc5e41e
Author: Christian Kirbach <christian kirbach gmail com>
Date:   Sun Feb 25 23:03:49 2018 +0100

    help: Fix various grammar issues and missing words

 help/C/overview.page |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/help/C/overview.page b/help/C/overview.page
index cc5340a..ab5046e 100644
--- a/help/C/overview.page
+++ b/help/C/overview.page
@@ -30,8 +30,8 @@
   <terms>
     <item>
       <title>A terminal</title>
-      <p>A terminal is a text input point in a computer also called the Command
-      Line Interface (CLI).</p>
+      <p>A terminal is a text input point in a computer that is also called
+       the Command Line Interface (CLI).</p>
     </item>
     <item>
       <title>Physical terminals</title>
@@ -44,7 +44,7 @@
       <p>Emulation is the ability of a computer program to imitate another
       program or device.</p>
 
-      <p>A terminal emulator also called tty is a software program that emulates
+      <p>A terminal emulator, also called tty, is a software program that emulates
       a video terminal in modern computers that use graphical user interfaces
       and provide interactive access to applications that run only in the
       command line environments. These applications may be running either on the
@@ -77,13 +77,13 @@
 
     <item>
       <title>Prompt</title>
-      <p>A prompt also called a <em>command prompt</em>. It is a sequence of
+      <p>A prompt is also called a <em>command prompt</em>. It is a sequence of
       characters used in the command line environment to indicate the readiness
       of the shell to accept commands.</p>
 
-      <p>A prompt usually ends with characters <sys>$</sys>, <sys>%</sys>,
-      <sys>#</sys> or <sys>&gt;</sys> and include
-      information about path of present working directory. On Unix based
+      <p>A prompt usually ends with the characters <sys>$</sys>, <sys>%</sys>,
+      <sys>#</sys> or <sys>&gt;</sys> and includes
+      information about the path of the present working directory. On Unix based
       systems, it is common for the prompt to end in a <sys>$</sys> or 
       <sys>#</sys> character depending on the user role such as <sys>$</sys>
       for user and <sys>#</sys> for superuser (also called <sys>root</sys>).