Fix typos

Author: zoffixznet

doc/Type/Signature.pod6

@@ -797,8 +797,8 @@ and follows the same semantics as L<Capture> C<$topic>:
     set(<a b>) ~~ :(:$a, :$b);    # OUTPUT: «True»
 
 Since L«C<where> clauses|/type/Signature#index-entry-where_clause_(Signature)»
-are not introspectable, the method cannot determine whether one signature
-L<ACCEPTS> the same sort of C<where>-constrained parameter. Such such comparisons
+are not introspectable, the method cannot determine whether two signatures
+L<ACCEPTS> the same sort of C<where>-constrained parameters. Such comparisons
 will return C<False>. This includes signatures with literals, which are just
 sugar for the C<where>-constraints: