docs: Fix the changelog_pattern regex in the monorepo tutorial

Author: baluyotraf

docs/tutorials/monorepo_guidance.md

@@ -71,11 +71,11 @@ Example config and commit for `library-b`:
 
 ```toml
 [tool.commitizen.customize]
-changelog_pattern = "^(feat|fix)\\(library-b\\)(!)?:" #the pattern on types can be a wild card or any types you wish to include
+changelog_pattern = "^(feat|fix)\(library-b\)(!)?:" #the pattern on types can be a wild card or any types you wish to include
 ```
 
 A commit message looking like this, would be included:
 
 ```
-fix:(library-b) Some awesome message
+fix(library-b): Some awesome message
 ```