update changelog for papc 2.0 (#286)

* update changelog

* remove backtics from heading
that's not actually supported

README.md

@@ -435,7 +435,7 @@ See [CONTRIBUTING.md](https://github.com/pantheon-systems/pantheon-advanced-page
 
 ### 2.0.0 ###
 * Adds new admin alerts and Site Health tests about default cache max age settings and recommendations [[#268](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/268), [#271](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/271)]. The default Pantheon GCDN cache max age value has been updated to 1 week in the [Pantheon MU plugin](https://github.com/pantheon-systems/pantheon-mu-plugin). For more information, see the [release note](https://docs.pantheon.io/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update).
-* Updated UI in Pantheon Page Cache admin page when used in a Pantheon environment (with the Pantheon MU plugin). [[#272](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/272)]
+* Updated UI in Pantheon Page Cache admin page when used in a Pantheon environment (with the Pantheon MU plugin). [[#272](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/272)] This UI change takes effect when [Pantheon MU plugin version 1.4.3](https://docs.pantheon.io/release-notes/2024/05/pantheon-mu-plugin-1-4-3-update) is available on your site.
 * Automatically updates the cache max age to the recommended value (1 week) if it was saved at the old default value (600 seconds). [[#269](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/269)]
 * Adds a hook into the `nonce_life` filter when nonces are created on the front-end to set the `pantheon_cache_default_max_age` to less than the nonce lifetime to avoid nonces expiring before the cache does. [[#282](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/282)] props [@ryanshoover](https://github.com/ryanshoover)
 

readme.txt

@@ -361,7 +361,7 @@ The above example would disable _only_ the admin notice recommending a higher ca
 
 == Other Filters ==
 
-= `pantheon_apc_disable_admin_notices` =
+= pantheon_apc_disable_admin_notices =
 Since 2.0.0, Pantheon Advanced Page Cache displays a number of admin notices about your current cache max age value. You can disable these notices with the `pantheon_apc_disable_admin_notices` filter.
 
 	add_filter( 'pantheon_apc_disable_admin_notices', '__return_true' );
@@ -392,7 +392,7 @@ See [CONTRIBUTING.md](https://github.com/pantheon-systems/wp-saml-auth/blob/mast
 
 = 2.0.0 (28 May 2024) =
 * Adds new admin alerts and Site Health tests about default cache max age settings and recommendations [[#268](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/268), [#271](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/271)]. The default Pantheon GCDN cache max age value has been updated to 1 week in the [Pantheon MU plugin](https://github.com/pantheon-systems/pantheon-mu-plugin). For more information, see the [release note](https://docs.pantheon.io/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update).
-* Updated UI in Pantheon Page Cache admin page when used in a Pantheon environment (with the Pantheon MU plugin). [[#272](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/272)]
+* Updated UI in Pantheon Page Cache admin page when used in a Pantheon environment (with the Pantheon MU plugin). [[#272](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/272)] This UI change takes effect when [Pantheon MU plugin version 1.4.3](https://docs.pantheon.io/release-notes/2024/05/pantheon-mu-plugin-1-4-3-update) is available on your site.
 * Automatically updates the cache max age to the recommended value (1 week) if it was saved at the old default value (600 seconds). [[#269](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/269)]
 * Adds a hook into the `nonce_life` filter when nonces are created on the front-end to set the `pantheon_cache_default_max_age` to less than the nonce lifetime to avoid nonces expiring before the cache does. [[#282](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/282)] props [@ryanshoover](https://profiles.wordpress.org/ryanshoover/)