Clarify sticker constraints (discord#5852)

docs/resources/Sticker.md

@@ -132,14 +132,16 @@ Every guilds has five free sticker slots by default, and each Boost level will g
 > warn
 > Lottie stickers can only be uploaded on guilds that have either the `VERIFIED` and/or the `PARTNERED` [guild feature](#DOCS_RESOURCES_GUILD/guild-object-guild-features). 
 
+> warn
+> Uploaded stickers are constrained to 5 seconds in length for animated stickers, and 320 x 320 pixels.
 ###### Form Params
 
 | Field       | Type          | Description                                                                                  |
 | ----------- | ------------- | -------------------------------------------------------------------------------------------- |
 | name        | string        | name of the sticker (2-30 characters)                                                        |
 | description | string        | description of the sticker (empty or 2-100 characters)                                       |
 | tags        | string        | autocomplete/suggestion tags for the sticker (max 200 characters)                            |
-| file        | file contents | the sticker file to upload, must be a PNG, APNG, GIF, or Lottie JSON file, max 500 KB        |
+| file        | file contents | the sticker file to upload, must be a PNG, APNG, GIF, or Lottie JSON file, max 512 KB        |
 
 ## Modify Guild Sticker % PATCH /guilds/{guild.id#DOCS_RESOURCES_GUILD/guild-object}/stickers/{sticker.id#DOCS_RESOURCES_STICKER/sticker-object}