remove trailing whitespace

Author: coke

doc/Language/modules.pod6

@@ -78,7 +78,6 @@ It is equivalent to:
 
 C<require> loads a compunit and imports definite symbols at runtime.
 
-    
     say "loading MyModule";
     require MyModule;
 
@@ -122,7 +121,7 @@ a C<Failure>. The correct way is:
 
     # Use return value to test whether loading succeeded:
     (try require Foo) === Nil and say "Failed to load Foo!";
-    
+
     # Or use a run-time symbol lookup with require, to avoid compile-time
     # package installation:
     try require ::('Foo');