fixed typo

Co-authored-by: Ollie <69084614+olijeffers0n@users.noreply.github.com>

Author: Hinterhaeltiger

docs/paper/dev/api/commands-api/arguments.mdx

@@ -5,7 +5,7 @@ description: A guide to Paper's Brigadier command API.
 
 # Arguments
 
-Argumenttypes are datatypes that we can use instead of strings.
+Argument types are datatypes that we can use instead of strings.
 
 :::danger[Experimental]