Revert "Update Str.pod6"

Author: tbrowder

doc/Type/Str.pod6

@@ -837,7 +837,7 @@ one of the following will:
 
 =head2 method starts-with
 
-    multi method starts-with(Str:D: Str(Cool) $needle --> Bool:D)
+    multi method starts-with(Str:D: Str(Cool) $needle --> True:D)
 
 Returns C<True> if the invocant is identical to or starts with C<$needle>.
 
@@ -846,7 +846,7 @@ Returns C<True> if the invocant is identical to or starts with C<$needle>.
 
 =head2 method ends-with
 
-    multi method ends-with(Str:D: Str(Cool) $needle --> Bool:D)
+    multi method ends-with(Str:D: Str(Cool) $needle --> True:D)
 
 Returns C<True> if the invocant is identical to or ends with C<$needle>.