[orca/gnome-3-28] help: Fix a typo

[Joanmarie Diggs <joanied src gnome org>]

commit 6daa063566b2a8177e7d393b0be1edbe46626b4e
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Sat Apr 14 11:53:20 2018 +0200

    help: Fix a typo
    
    (much match -> must match)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795255

 help/C/preferences_gecko.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/preferences_gecko.page b/help/C/preferences_gecko.page
index 0b47bb1..20723bb 100644
--- a/help/C/preferences_gecko.page
+++ b/help/C/preferences_gecko.page
@@ -187,7 +187,7 @@
       <title>Minimum length of matched text</title>
       <p>
         This editable spin button is where you can specify the number of
-        characters which much match before <app>Orca</app> announces the
+        characters which must match before <app>Orca</app> announces the
         matching line. This option is also designed to prevent "chattiness"
         as there are many matches when you first begin typing the string
         for which you are searching.