Turning on error test for curly quotes

Signed-off-by: Lynette Miles <[email protected]>

Author: esmerel

CONTRIBUTING.md

@@ -123,4 +123,11 @@ possible. For example:
 ### Vale
 
 The Fluent Bit maintainers use the [Vale](https://vale.sh/docs/) plugin, which lints
-pull requests and adds suggestions to improve style and clarity.
+pull requests and adds suggestions to improve style and clarity. Most Vale tests are
+at the `suggestion` level and will not block merging.
+
+The following tests are at a `warning` level and will prevent merging:
+
+- NonStandardQuotes: Use standard quotes. Google docs use curly quotes. Copy and
+  pasting from Google docs requires correcting the quotes. You can
+  [turn off smart quotes](https://support.google.com/docs/thread/217182974/can-i-turn-smart-quotes-off-in-a-google-doc?hl=en).

vale-styles/FluentBit/NonStandardQuotes.yml

@@ -1,7 +1,7 @@
 ---
 extends: existence
 message: 'Use standard single quotes or double quotes only. Do not use left or right quotes.'
-level: suggestion
+level: error
 ignorecase: true
 scope: raw
 raw: