cgitrc.5.txt: wrap the example file in an asciidoc LiteralBlock

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgitrc.5.txt

@@ -259,6 +259,7 @@ repo.url::
 EXAMPLE CGITRC FILE
 -------------------
 
+....
 # Enable caching of up to 1000 output entriess
 cache-size=1000
 
@@ -368,6 +369,7 @@ repo.enable-log-linecount=0
 
 # Restrict the max statistics period for this repo
 repo.max-stats=month
+....
 
 
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