Add support for EDoc verbatim quoting for erlang comments

[jeko2000]

Expected behavior

Smartparens should pair a backquote ` with a single quote ' inside erlang comments to support EDoc verbatim quoting.

Actual behavior

Smartparens pairs backquote with itself inside comments.

Steps to reproduce the problem

In erlang-mode, create a comment by typing at least one % followed by a `. The result is

%% ``

instead of the desired

%% `'

Environment & version information

• smartparens version: 20220623.1523
• Active major-mode: erlang-mode
• Smartparens strict mode: t
• Emacs version (M-x emacs-version): GNU Emacs 28.0.60 (build 1, aarch64-apple-darwin21.1.0, NS appkit-2113.00 Version 12.0.1 (Build 21A559)) of 2021-11-01
• Starterkit/Distribution: Vanilla
• OS: darwin