Add new methods to docs

docs/api.md

@@ -19,6 +19,7 @@ The base class for all Bloxlink API interactions.
     **Parameters:**
     * **discord_id (int)**: the Roblox ID of the user you want to find the Discord ID of.
     * **server_id (int)**: the ID of the server you want to search in.
+
     \**if you intend on doing a global search (which required approval), do not include this argument.
     Otherwise, you must provide this argument.*
 
@@ -30,6 +31,7 @@ The base class for all Bloxlink API interactions.
     **Parameters:**   
     * **roblox_id (int)**: the ID of the Discord user you want to find the Roblox ID of.
     * **server_id (int)***: the ID of the server you want to search in.
+
     \**if you intend on doing a global search (which required approval), do not include this argument.
     Otherwise, you must provide this argument.*
 
@@ -84,6 +86,22 @@ This information is only retrieved if you have Bloxlink Premium.
 * **has_verified_badge (Optional[str])**: Whether the user has a verified badge.
 * **groups2 (Optional[str])**: The Roblox users' groups. (this lists the groups in a dictionary using the group ID as the key as opposed to a list)
 
+**Methods:**
+* **await get_avatar_headshot_url()**
+
+    Makes a request to Roblox's API for the avatar headshot image URL.
+        Returns None if avatar can't be retrieved.
+
+* **await get_avatar_bust_url()**
+
+    Makes a request to Roblox's API for the avatar bust image URL.
+        Returns None if avatar can't be retrieved.
+
+* **await get_avatar_fullbody_url()**
+
+    Makes a request to Roblox's API for the avatar full body image URL.
+        Returns None if avatar can't be retrieved.
+
 ## Responses
 `class bloxlink.RobloxUserResponse`