remove invalid example condition (#852)

Author: bshaffer

aip/client-libraries/4232.md

@@ -30,7 +30,6 @@ some cases but not others, as appropriate in the environment. For example, any
 of the following strategies would be permissible:
 
 - Providing overloads iff all arguments in the signature are primitives.
-- Providing overloads iff all arguments in the signature are required.
 - Providing overloads only for the first of multiple signatures when providing
   more than one would produce a conflict.
 - Any combination of the above.