runtime(doc): Fix a typo in usr_30.txt

closes: #14662

Signed-off-by: UM-Li <um-li@tuta.io>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/usr_30.txt b/runtime/doc/usr_30.txt
index 19a1259..c3bbcba 100644
--- a/runtime/doc/usr_30.txt
+++ b/runtime/doc/usr_30.txt
@@ -1,4 +1,4 @@
-*usr_30.txt*	For Vim version 9.1.  Last change: 2007 Nov 10
+*usr_30.txt*	For Vim version 9.1.  Last change: 2024 Apr 29
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -246,7 +246,7 @@
 
 	=a{
 
-I you have really badly indented code, you can re-indent the whole file with:
+If you have really badly indented code, you can re-indent the whole file with:
 >
 	gg=G