Fix typo

"recieve" is a misspelling of "receive": https://en.wiktionary.org/wiki/recieve

Author: WebCoder49

spec/ActivityPub.md

@@ -1,6 +1,6 @@
 # ActivityPub
 
-A decentralized social networking protocol based upon the ActivityStreams 2.0 data format and JSON-LD. Pixelfed uses ActivityPub to send and recieve activities from other Pixelfed servers and other fediverse software like Mastodon.
+A decentralized social networking protocol based upon the ActivityStreams 2.0 data format and JSON-LD. Pixelfed uses ActivityPub to send and receive activities from other Pixelfed servers and other fediverse software like Mastodon.
 
 ## Context
 
@@ -328,4 +328,4 @@ By following these steps, Pixelfed ensures that its federation requests to Masto
 
 <!-- ## Delivery -->
 
-<!-- ## Shared Inbox -->
+<!-- ## Shared Inbox -->