[MI-3553] Update documentation (#321)

docs/plugin_setup.md

@@ -15,5 +15,7 @@
     - **Sync direct and group messages**: Enable this for enabling the syncing of direct and group messages.
     - **Enabled Teams**: This config is for the Mattermost teams for which syncing is enabled. Enter a comma-separated list of Mattermost team names. If you leave it empty, it will enable syncing for all the teams.
     - **Prompt interval for DMs and GMs (in hours)**: This setting is for configuring the interval after which the user will get a prompt to connect their account when they try to post a message in a DM or GM without connecting their account. Leaving it empty will disable the prompt.
+    - **Maximum size of attachments to support complete one time download (in MB)**: This setting is for configuring the maximum size of attachments that can be loaded into memory. Attachments bigger than this size will be streamed from MS Teams to Mattermost.
+    - **Buffer size for streaming files (in MB)**: This setting is for configuring the buffer size for streaming files from MS Teams to Mattermost.
 
-    ![image](https://github.com/mattermost/mattermost-plugin-msteams-sync/assets/100013900/077058f2-cd59-4287-a85d-12e6d158d208)
+    ![image](https://github.com/mattermost/mattermost-plugin-msteams-sync/assets/100013900/e6a74693-1760-401f-bac2-83749c49fa2e)