Merge bitcoin#14625: Make clear function argument case in dev notes

9605bbd Make clear function argument case in dev notes (Carl Dong)

Pull request description:

  Rationale:

  For new developers, they might be confused if they see that function arguments are sometimes `camelCase`'d in the codebase. This makes it clear that they _should_ be `snake_case`'d (maybe because no one's gotten to fixing them yet).

Tree-SHA512: 9db16d1fedf9761121844a0865ae3fefea94b5dbdfb36cb18f99cbc73e117f7d798a019f28a1c8bca19772502de2f9ed063f03bd911ffc4d248ec7386cd87d97

doc/developer-notes.md

@@ -70,7 +70,7 @@ 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.