fix 'wildcase' help formatting

locale/en-US/options.txt

@@ -726,6 +726,7 @@ Defines how completions are matched with regard to character case.
 "match"		Case is always significant
 "ignore"	Case is never significant
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+
 ____
 
 
@@ -733,7 +734,7 @@ ____
 ||'wildignore' 'wig'|| stringlist (default: "")
 ____
 List of file patterns to ignore when completing files. E.g. to ignore object
-files and Vim swap files [c]:set wildignore=.*\.o,\..*\.s[a-z]{2}[c]
+files and Vim swap files [c]:set wildignore=.*\.o,\..*\.s[a-z]\\{2}[c]
 
 Note: Unlike Vim each pattern is a regexp rather than a glob.
 ____