chore: add run-disable directives to no-bench-string-concat README examples

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/_tools/eslint/rules/no-bench-string-concat/README.md

@@ -42,6 +42,8 @@ var rule = require( '@stdlib/_tools/eslint/rules/no-bench-string-concat' );
 
 **Bad**:
 
+<!-- run-disable -->
+
 <!-- eslint-disable stdlib/no-bench-string-concat, no-restricted-syntax -->
 
 ```javascript
@@ -52,6 +54,8 @@ bench( pkg+':len='+len, function benchmark( b ) {
 
 **Good**:
 
+<!-- run-disable -->
+
 <!-- eslint-disable no-restricted-syntax -->
 
 ```javascript