Mark all APIs that do not require authentication (#142)

Using-the-API/API.md

@@ -292,6 +292,7 @@ Returns the local representation of the followed account, as an [Account](#accou
     GET /api/v1/instance
 
 Returns the current [Instance](#instance).
+
 Does not require authentication.
 
 ### Media
@@ -386,6 +387,8 @@ Returns [Results](#results).
 If `q` is a URL, Mastodon will attempt to fetch the provided account or status.
 Otherwise, it will do a local account and hashtag search.
 
+Does not require authentication.
+
 ### Statuses
 
 #### Fetching a status:
@@ -394,18 +397,24 @@ Otherwise, it will do a local account and hashtag search.
 
 Returns a [Status](#status).
 
+Does not require authentication.
+
 #### Getting status context:
 
     GET /api/v1/statuses/:id/context
 
 Returns a [Context](#context).
 
+Does not require authentication.
+
 #### Getting a card associated with a status:
 
     GET /api/v1/statuses/:id/card
 
 Returns a [Card](#card).
 
+Does not require authentication.
+
 #### Getting who reblogged/favourited a status:
 
     GET /api/v1/statuses/:id/reblogged_by
@@ -421,6 +430,8 @@ Query parameters:
 
 Returns an array of [Accounts](#account).
 
+Does not require authentication.
+
 #### Posting a new status:
 
     POST /api/v1/statuses
@@ -474,6 +485,8 @@ Query parameters:
 `max_id` and `since_id` are usually get from the `Link` header.
 
 Returns an array of [Statuses](#status), most recent ones first.
+
+'public' and 'tag' timelines do not require authentication.
 ___
 
 ## Entities