docs(readme): document vhosts clean/cleanup

Linked to #372

Properly document ``apache.config.vhosts.clean`` and ``apache.config.vhosts.cleanup``, and the differences between them.

* Automated using https://github.com/myii/ssf-formula/pull/378

* Automated using https://github.com/myii/ssf-formula/pull/375

* Automated using https://github.com/myii/ssf-formula/pull/374

* Automated using https://github.com/myii/ssf-formula/pull/370

* Automated using https://github.com/myii/ssf-formula/pull/369

* Automated using https://github.com/myii/ssf-formula/pull/368

* Automated using https://github.com/myii/ssf-formula/pull/999

* Automated using https://github.com/myii/ssf-formula/pull/367

* Automated using https://github.com/myii/ssf-formula/pull/364

# [1.2.0](https://github.com/saltstack-formulas/apache-formula/compare/v1.1.8...v1.2.0) (2021-08-28)

### Bug Fixes

* **suse:** use correct vhostdir and sitesdir for suse family ([#369](https://github.com/saltstack-formulas/apache-formula/issues/369)) ([fe0ceb7](fe0ceb78b7)), closes [/documentation.suse.com/sles/15-SP3/html/SLES-all/cha-apache2.html#sec-apache2](https://github.com//documentation.suse.com/sles/15-SP3/html/SLES-all/cha-apache2.html/issues/sec-apache2)

### Continuous Integration

* **3003.1:** update inc. AlmaLinux, Rocky & `rst-lint` [skip ci] ([2e116ec](2e116ec412))
* **freebsd:** update with latest pre-salted Vagrant boxes [skip ci] ([d679580](d67958043d))
* **gemfile+lock:** use `ssf` customised `inspec` repo [skip ci] ([5dd7009](5dd700944b))
* **kitchen:** move `provisioner` block & update `run_command` [skip ci] ([0d1a6dc](0d1a6dc75d))
* **kitchen+ci:** update with latest `3003.2` pre-salted images [skip ci] ([d3641d7](d3641d7f0d))
* add Debian 11 Bullseye & update `yamllint` configuration [skip ci] ([7741b90](7741b90ff6))

### Features

* **alma+rocky:** add platforms (based on CentOS 8) [skip ci] ([4353e57](4353e57a1b))

The Suse family of distributions does not implement the sites-available/sites-enabled
distinction and puts all vhosts into /etc/apache2/vhosts.d.

Sources:
- https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-apache2.html#sec-apache2-configuration-manually
- https://build.opensuse.org/package/view_file/openSUSE:Factory/apache2/apache2-httpd.conf?expand=1

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* Automated using https://github.com/myii/ssf-formula/pull/360

* Automated using https://github.com/myii/ssf-formula/pull/359

* Automated using https://github.com/myii/ssf-formula/pull/358

* Automated using https://github.com/myii/ssf-formula/pull/357

* Automated using https://github.com/myii/ssf-formula/pull/356

* Automated using https://github.com/myii/ssf-formula/pull/353

* Automated using https://github.com/myii/ssf-formula/pull/350

* Automated using https://github.com/myii/ssf-formula/pull/349

* Automated using https://github.com/myii/ssf-formula/pull/345

* Automated using https://github.com/myii/ssf-formula/pull/344

* Automated using https://github.com/myii/ssf-formula/pull/343

* Automated using https://github.com/myii/ssf-formula/pull/340

* Automated using https://github.com/myii/ssf-formula/pull/335

## [1.1.8](https://github.com/saltstack-formulas/apache-formula/compare/v1.1.7...v1.1.8) (2021-06-28)

### Bug Fixes

* **register_site:** correct semicolon to colon ([4cf848d](4cf848da05))

### Continuous Integration

* **gitlab-ci:** ignore line to avoid `yamllint` violation [skip ci] ([a742f4e](a742f4ee00))
* **gitlab-ci:** use `pandoc`-enabled `semantic-release` image [skip ci] ([3bf9c6e](3bf9c6e6a9))
* **kitchen+gitlab:** remove Ubuntu 16.04 & Fedora 32 (EOL) [skip ci] ([10ce382](10ce3822dd))
* **kitchen+gitlab:** remove Ubuntu 16.04 & Fedora 32 (EOL) [skip ci] ([57e9873](57e9873624))

Correct semicolon to colon

* Automated using https://github.com/myii/ssf-formula/pull/331

* Automated using https://github.com/myii/ssf-formula/pull/331

* Automated using https://github.com/myii/ssf-formula/pull/325

## [1.1.7](https://github.com/saltstack-formulas/apache-formula/compare/v1.1.6...v1.1.7) (2021-05-14)

### Bug Fixes

* **mod_pagespeed:** add missing colon to `file.directory` ([a8b87a5](a8b87a583e))

### Continuous Integration

* add `arch-master` to matrix and update `.travis.yml` [skip ci] ([069388b](069388be3a))

Fix yaml syntax error.

* Automated using https://github.com/myii/ssf-formula/pull/323

## [1.1.6](https://github.com/saltstack-formulas/apache-formula/compare/v1.1.5...v1.1.6) (2021-05-08)

### Documentation

* **changelog:** regenerate via. `semantic-release` ([de8c82c](de8c82c753))