Adding Repetition test to error levels

CONTRIBUTING.md

@@ -131,8 +131,10 @@ The following tests are at a `error` level and will prevent merging:
 - [NonStandardQuotes](https://github.com/fluent/fluent-bit-docs/blob/master/vale-styles/FluentBit/NonStandardQuotes.yml):
   [Use standard quotes](https://developers.google.com/style/quotation-marks#straight-and-curly-quotation-marks).
   By default, Google Docs and Microsoft Word turn standard straight quotes into "smart"
-  curly quotes. If you copy-paste from one of these tools, you must correct the quotes 
-  back to straight quotes. You can also turn off smart quotes 
-  in [Google Docs](https://support.google.com/docs/thread/217182974/can-i-turn-smart-quotes-off-in-a-google-doc?hl=en) 
+  curly quotes. If you copy-paste from one of these tools, you must correct the quotes
+  back to straight quotes. You can also turn off smart quotes
+  in [Google Docs](https://support.google.com/docs/thread/217182974/can-i-turn-smart-quotes-off-in-a-google-doc?hl=en)
   or [Microsoft Word](https://support.microsoft.com/en-us/office/smart-quotes-in-word-and-powerpoint-702fc92e-b723-4e3d-b2cc-71dedaf2f343)
   to prevent this problem.
+- [Repetition](https://github.com/errata-ai/vale/blob/v3/testdata/styles/Markup/Repetition.yml):
+  Checks for the same word used twice in succession.

vale-styles/FluentBit/Repetition.yml

@@ -1,7 +1,7 @@
 ---
 extends: repetition
 message: '"%s" is repeated.'
-level: suggestion
+level: error
 alpha: true
 tokens:
   - '[^\s]+'