message: Make clear function argument case in dev notes
diff: @@ -69,7 +69,7 @@ tool to clean up patches automatically before submission.
  - **Symbol naming conventions**. These are preferred in new code, but are not
  required when doing so would need changes to significant pieces of existing
  code.
  - - Variable and namespace names are all lowercase, and may use `_` to
  + - Variable (including function arguments) and namespace names are all lowercase, and may use `_` to
  separate words (snake_case).
  - Class member variables have a `m_` prefix.
  - Global variables have a `g_` prefix.
  