docs: Update Generators-Git.md (#14921) (#14934)

Remove a misleading symbol from the pattern for the path.Match function. The pipe symbol doesn't have any special meaning.

Signed-off-by: German Lashevich <german.lashevich@gmail.com>
Co-authored-by: German Lashevich <design.ber@gmail.com>

docs/operator-manual/applicationset/Generators-Git.md

@@ -157,7 +157,7 @@ Or, a shorter way (using [path.Match](https://golang.org/pkg/path/#Match) syntax
 
 ```yaml
 - path: /d/*
-- path: /d/[f|g]
+- path: /d/[fg]
   exclude: true
 ```