Add GitHub Action to check spelling (#3591)

Signed-off-by: Aaron Raimist <aaron@raim.ist>

data/api/identity/v2_email_associations.yaml

@@ -63,7 +63,7 @@ paths:
             $ref: "definitions/sid.yaml"
         400:
           description: |
-            An error ocurred.  Some possible errors are:
+            An error occurred.  Some possible errors are:
 
             - `M_INVALID_EMAIL`: The email address provided was invalid.
             - `M_EMAIL_SEND_ERROR`: The validation email could not be sent.

data/api/identity/v2_phone_associations.yaml

@@ -63,7 +63,7 @@ paths:
             $ref: "definitions/sid.yaml"
         400:
           description: |
-            An error ocurred. Some possible errors are:
+            An error occurred. Some possible errors are:
 
             - `M_INVALID_ADDRESS`: The phone number provided was invalid.
             - `M_SEND_ERROR`: The validation SMS could not be sent.

data/api/identity/v2_ping.yaml

@@ -34,7 +34,7 @@ paths:
         To discover that an identity server is available at a specific URL,
         this endpoint can be queried and will return an empty object.
 
-        This is primarly used for auto-discovery and health check purposes
+        This is primarily used for auto-discovery and health check purposes
         by entities acting as a client for the identity server.
       operationId: pingV2
       responses:

data/api/identity/v2_store_invite.yaml

@@ -88,7 +88,7 @@ paths:
                   The Matrix room alias for the room to which the user is
                   invited. This should be retrieved from the `m.room.canonical_alias`
                   state event.
-                example: "#somewhere:exmaple.org"
+                example: "#somewhere:example.org"
               room_avatar_url:
                 type: string
                 description: |-
@@ -150,7 +150,7 @@ paths:
               }
         400:
           description: |
-            An error has occured.
+            An error has occurred.
 
             If the 3pid is already bound to a Matrix user ID, the error code
             will be `M_THREEPID_IN_USE`.  If the medium is unsupported, the