[bugfix]: Add missing Link headers in Swagger spec (#2751)

* Adds Link headers to all endpoints that use it for paging
* Fixes the return type for listing what accounts someone follows

internal/api/client/accounts/followers.go

@@ -102,6 +102,10 @@ import (
 //				type: array
 //				items:
 //					"$ref": "#/definitions/account"
+//			headers:
+//				Link:
+//					type: string
+//					description: Links to the next and previous queries.
 //		'400':
 //			description: bad request
 //		'401':

internal/api/client/accounts/following.go

@@ -99,9 +99,13 @@ import (
 //			name: accounts
 //			description: Array of accounts that are followed by this account.
 //			schema:
-//			type: array
-//			items:
-//				"$ref": "#/definitions/account"
+//				type: array
+//				items:
+//					"$ref": "#/definitions/account"
+//			headers:
+//				Link:
+//					type: string
+//					description: Links to the next and previous queries.
 //		'400':
 //			description: bad request
 //		'401':

internal/api/client/accounts/statuses.go

@@ -119,6 +119,10 @@ import (
 //				type: array
 //				items:
 //					"$ref": "#/definitions/status"
+//			headers:
+//				Link:
+//					type: string
+//					description: Links to the next and previous queries.
 //		'400':
 //			description: bad request
 //		'401':