Add WordPress to implementation lists (#774)

Add WordPress (ActivityPub plugin) to the implementation sections of FEPs where it was missing: FEP-3b86, FEP-4f05, FEP-5feb, FEP-8fcf, and FEP-f1d5.

Co-authored-by: Matthias Pfefferle <pfefferle@users.noreply.github.com>
Reviewed-on: https://codeberg.org/fediverse/fep/pulls/774
Co-authored-by: Matthias Pfefferle <matthias.pfefferle@noreply.codeberg.org>
Co-committed-by: Matthias Pfefferle <matthias.pfefferle@noreply.codeberg.org>

fep/3b86/fep-3b86.md

@@ -727,6 +727,7 @@ This is a list of client tools that allow end-users to use Activity Intents on r
 
 * [Emissary](https://emissary.dev) publishes "share" and "like" buttons
 * [Forte](https://codeberg.org/fortified/forte) and also [the "streams" repository](https://codeberg.org/streams/streams) publish "wall-to-wall" post/reply buttons, as an alternative to carrying out these same operations directly on the home server using OpenWebAuth (FEP-61cf). Other interactions in progress. 
+* [WordPress](https://wordpress.org/plugins/activitypub/) publishes "like" and "announce" buttons ([PR #2988](https://github.com/Automattic/wordpress-activitypub/pull/2988), [PR #2256](https://github.com/Automattic/wordpress-activitypub/pull/2256))
 * Web Intents library (in progress)
 
 

fep/4f05/fep-4f05.md

@@ -97,6 +97,7 @@ The recipients list of the published `Delete` activity is outside the scope of t
 
 * NodeBB
 * Discourse
+* [WordPress](https://wordpress.org/plugins/activitypub/) ([PR](https://github.com/Automattic/wordpress-activitypub/pull/2824))
 
 ## References
 

fep/5feb/fep-5feb.md

@@ -63,6 +63,7 @@ Considering this attribute is purely advisory, special care SHOULD be given to t
 ## Implementations
 
 - Mastodon, as of v4.2.0
+- [WordPress](https://wordpress.org/plugins/activitypub/) ([PR](https://github.com/Automattic/wordpress-activitypub/pull/1824))
 
 ## References
 

fep/8fcf/fep-8fcf.md

@@ -160,6 +160,7 @@ server, the receiving end:
 - [Implemented by Mastodon](https://github.com/tootsuite/mastodon/pull/14510) since v3.3.0
 - [Implemented by Fedify](https://fedify.dev/manual/send#followers-collection-synchronization) since Fedify 0.8.0, made optional in Fedify 1.5.0
 - [Implemented by Tootik](https://github.com/dimkr/tootik/blob/0.18.0/FEDERATION.md#followers-synchronization)
+- [Implemented by WordPress](https://wordpress.org/plugins/activitypub/) ([PR](https://github.com/Automattic/wordpress-activitypub/pull/2297))
 
 ## References
 

fep/f1d5/fep-f1d5.md

@@ -112,6 +112,7 @@ This list is not comprehensive:
 * epicyon
 * apcore
 * FIRM
+* [WordPress](https://wordpress.org/plugins/activitypub/) ([PRs](https://github.com/search?q=repo%3AAutomattic%2Fwordpress-activitypub+NodeInfo&type=pullrequests))
 
 ### Clients