Remove unnecessary :func: & :meth: parentheses from reST content

[mattwang44]

Subject: Remove unnecessary :func: parentheses

Feature or Bugfix

• Bugfix (doc)

Purpose

• We're introducing a new rule to the sphinx-lint (issue & PR) and, since sphinx-lint utilizes Sphinx doc content in the CI, we'd like to also fix the issue.

Detail

• fix unnecessary :func: parentheses under doc.

Relates

resolve #12847

[mattwang44]

Fix up the meth roles too, as suggested by @AA-Turner (ref).