[release-notes] correct small language bits

[Link Dupont <link src gnome org>]

commit 241bc1cebab562003d967cd41e4a18be2adb2770
Author: Link Dupont <link sub-pop net>
Date:   Tue Aug 31 13:59:51 2021 -0400

    correct small language bits

 help/C/index.page | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)
---
diff --git a/help/C/index.page b/help/C/index.page
index 220a46f0..75b5f8d3 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -12,6 +12,15 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
   <info>
     <title type="link">GNOME &gnomeversion; Release Notes</title>
     <title type="text">GNOME &gnomeversion; Release Notes</title>
+    <desc>New features for users</desc>
+    <credit type="author">
+      <name its:translate="no">Allan Day</name>
+      <email its:translate="no">aday gnome org</email>
+    </credit>
+    <credit type="author">
+      <name its:translate="no">Link Dupont</name>
+      <email its:translate="no">link gnome org</email>
+    </credit>
     <credit type="author">
       <name its:translate="no">Matthias Clasen</name>
       <email its:translate="no">matthiasc gnome org</email>
@@ -129,7 +138,7 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
   </section>
 
   <section id="performance">
-    <title>Smoother, faster</title>
+    <title>Performance Improvements</title>
 
     <p>GNOME is continually working to improve performance, responsiveness and
     smoothness, and GNOME &gnomeversion; includes a collection of improvements
@@ -146,8 +155,8 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
       <item><p>The transition when switching between workspaces is now more
       seamless, thanks to ensuring that there is a focused window on the
       workspaces that are being moved between.</p></item>
-      <item><p>Rendering has been improved GTK 4, with better performance as
-      well as bug fixes.</p></item>
+      <item><p>The GL renderer in GTK 4 has been rewritten, resulting in better
+      overall performance and correctness.</p></item>
       <item><p>Finally, a major code cleanup has happened in Mutter, GNOME's
       window manager, which will improve long-term maintainability and
       efficiency.</p></item>
@@ -155,7 +164,7 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
   </section>
 
   <section id="music">
-    <title>A prettier Music app</title>
+    <title>Music</title>
 
     <p><app>Music</app> has been given a round of UI polish for GNOME 41.
     Artwork is now larger and has rounded corners, the artist list includes
@@ -165,7 +174,7 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
   </section>
 
   <section id="thats-not-all">
-    <title>That's not all</title>
+    <title>That's Not All</title>
 
     <p>GNOME &gnomeversion; also includes lots of other, smaller improvements,
     including:</p>