runtime(doc): capitalize correctly

* do not capitalize after a double colon when introducing a list
* Capitalize a header line

closes: #15433

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
index d759c18..da13b46 100644
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -1,4 +1,4 @@
-*quickfix.txt*  For Vim version 9.1.  Last change: 2024 Jul 17
+*quickfix.txt*  For Vim version 9.1.  Last change: 2024 Aug 05
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1006,7 +1006,7 @@
 ==============================================================================
 5. Using :vimgrep and :grep				*grep* *lid*
 
-Vim has two ways to find matches for a pattern: Internal and external.  The
+Vim has two ways to find matches for a pattern: internal and external.  The
 advantage of the internal grep is that it works on all systems and uses the
 powerful Vim search patterns.  An external grep program can be used when the
 Vim grep does not do what you want.
@@ -1035,7 +1035,7 @@
         command! -nargs=+ NewGrep execute 'silent grep! <args>' | copen 42
 
 
-5.1 using Vim's internal grep
+5.1 Using Vim's internal grep
 
 					*:vim* *:vimgrep* *E682* *E683*
 :vim[grep][!] /{pattern}/[g][j][f] {file} ...