tweak wording, correct format errors

Author: tbrowder

doc/Language/control.pod6

@@ -313,8 +313,8 @@ the enclosing block and following statements are ignored; but when the C<if>
 block is executed, following statements are executed. (Note there are other ways to modify
 the default behavior of each which are discussed in other sections.)
 The following examples should illustrate the default block behavior
-assuming no special exit statements are included in the C<if> or C<when>
-blocks:
+assuming no special exit or other side effect statements are included 
+in the C<if> or C<when> blocks:
 
 =begin code :skip-test
 {
@@ -328,14 +328,15 @@ blocks:
 }
 =end code
 
-Should the <if> and <when> blocks above appear at file scope, following
+Should the C<if> and C<when> blocks above appear at file scope, following
 statements would be executed in each case.
 
 C<when> also has a statement modifier form which does not effect execution
 of following statements either inside or outside of another block:
 
 =begin code :skip-test
-say "foo" when X; # statement is executed, following statements not affected
+say "foo" when X; # if X is true statement is executed
+                  # following statements are not affected
 =end code