[gnote] Rename lefover Add-in to plugin

[Aurimas Černius <aurimasc src gnome org>]

commit 8fb68be30ea9a9d48a9047b9acac1521e774ed70
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sat Dec 18 21:47:14 2021 +0200

    Rename lefover Add-in to plugin
    
    Fixes https://gitlab.gnome.org/GNOME/gnote/-/issues/113

 help/C/gnote-addin-fixedwidth.page   | 2 +-
 help/C/gnote-addin-underline.page    | 2 +-
 help/C/gnote-addins-preferences.page | 8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/help/C/gnote-addin-fixedwidth.page b/help/C/gnote-addin-fixedwidth.page
index b7d973e1..20273cc9 100644
--- a/help/C/gnote-addin-fixedwidth.page
+++ b/help/C/gnote-addin-fixedwidth.page
@@ -22,7 +22,7 @@
     </credit>
   </info>
 
-  <title>Fixed Width Add-in</title>
+  <title>Fixed Width Plugin</title>
     <p>The <app>Fixed Width</app> plugin allows text to use a fixed width font. To change existing text, 
first select the text you want to modify. Then select <gui>Fixed Width</gui> from the <gui>Text</gui> menu. 
You can also select <gui>Fixed Width</gui> from the menu before you start typing.</p>
 
 </page>
diff --git a/help/C/gnote-addin-underline.page b/help/C/gnote-addin-underline.page
index a2294b32..243c8322 100644
--- a/help/C/gnote-addin-underline.page
+++ b/help/C/gnote-addin-underline.page
@@ -22,7 +22,7 @@
     </credit>
   </info>
 
-  <title>Underline Text Add-In</title>
+  <title>Underline Text Plugin</title>
   <p>When the <gui>Underline</gui> plugin is installed, the <gui>Text</gui> menu will have a 
<gui>Underline</gui> option available.</p>
   <p>To underline the selected text, use one of the following:</p>
   <list>
diff --git a/help/C/gnote-addins-preferences.page b/help/C/gnote-addins-preferences.page
index e8231d99..8a4b36c6 100644
--- a/help/C/gnote-addins-preferences.page
+++ b/help/C/gnote-addins-preferences.page
@@ -22,13 +22,13 @@
     </credit>
   </info>
 
-  <title>Add-in Preferences</title>
+  <title>Plugin Preferences</title>
     <p>You can activate or deactivate plugins in this tab. To do this, select a plugin and click the 
<gui>Enable</gui> button. Use the <gui>Disable</gui> button to disable a plugin.</p>
     <p>Some plugins have preferences, which you can access by selecting a plugin and pressing the 
<gui>Preferences</gui> button.</p>
-    <figure><title><app>Gnote</app> Addin Preferences</title>
-    <desc><app>Gnote</app> Add-ins window</desc>
+    <figure><title><app>Gnote</app> Plugin Preferences</title>
+    <desc><app>Gnote</app> Plugins window</desc>
     <media type="image" src="figures/gnote-preferences-add-ins.png" mime="image/png" style="right">
-      <p><gui>Add-ins</gui> window.</p>
+      <p><gui>Plugins</gui> window.</p>
     </media>
     </figure>