Add code text formatting guidelines (#415)

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

docs/sources/write/style-guide/style-conventions/index.md

@@ -269,3 +269,13 @@ Use italics formatting (\_ in Markdown), to emphasize a specific word or phrase.
 For example:
 
 > The Prometheus data model is arranged into _metrics_ that consist of a _timestamp_ and a _sample_.
+
+### Code
+
+Use code formatting (\` in Markdown) to refer to:
+
+- File names
+- Configuration options
+- User input
+- Code in text/inline text
+- Class and method names, status codes, and console output