Proposed changes

While reading the docs especially the accept_mutex_delay section the sentence there bugged me quiet a bit. So I just added two words that would make reading that it a bit more easier

If [accept_mutex](https://nginx.org/en/docs/ngx_core_module.html#accept_mutex) is enabled, specifies the maximum time during which a worker process will try to restart accepting new connections if another worker process is currently accepting new connections.

to

If [accept_mutex](https://nginx.org/en/docs/ngx_core_module.html#accept_mutex) is enabled, **this directive** specifies the maximum time during which a worker process will try to restart accepting new connections if another worker process is currently accepting new connections.

Part of documentation

I know this is isnt a big deal but it kinda bugged me a lot while reading it.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the contributing guidelines.
• I have signed the F5 Contributor License Agreement (CLA).
• If applicable, I have added tests that prove my fix is effective or that my feature works.
• If applicable, I have checked that any relevant tests pass after adding my changes.
• I have updated any relevant documentation (README.md and/or CHANGELOG.md).