fix(command-development): remove inconsistent backtick escaping

The bash pre-execution syntax examples on lines 396-398 used escaped
backticks (!\`) while all other examples in the file use unescaped
backticks (!`). This creates visual inconsistency in the documentation.

Fixes #58

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sjnims

plugins/plugin-dev/skills/command-development/references/plugin-features-reference.md

@@ -393,9 +393,9 @@ description: Commit with pre-commit validation
 allowed-tools: Bash(git:*)
 ---
 
-Stage changes: !\`git add $1\`
+Stage changes: !`git add $1`
 
-Commit changes: !\`git commit -m "$2"\`
+Commit changes: !`git commit -m "$2"`
 
 Note: This commit will trigger the plugin's pre-commit hook for validation.
 Review hook output for any issues.