Update README.md (#2983)

Fixed typo

Author: CodesAway

packages/cursorless-org-docs/src/docs/user/README.md

@@ -760,7 +760,7 @@ Join multiple lines together.
 eg:
 
 - `join air`: Join the line with the token containing the letter 'a' with its next line.
-- `join block air`: Joines all lines in the paragraph with the token containing the letter 'a' together into a single line.
+- `join block air`: Joins all lines in the paragraph with the token containing the letter 'a' together into a single line.
 
 ### Break