add comment on comments

also tweak punctuation

doc/Language/syntax.pod6

@@ -107,7 +107,7 @@ say "world"
 Complete statements ending in bare blocks can omit the trailing
 semicolon, if no additional statements on the same line follow the
 block's closing curly brace C<}>. This is called the "implied separator
-rule". For example, you don't need to write a semicolon after an C<if>
+rule." Ftor example, you don't need to write a semicolon after an C<if>
 statement block as seen above, and below.
 
 =begin code
@@ -156,7 +156,8 @@ say "world";
 =head2 Comments
 
 Comments are parts of the program text which are only intended for human
-readers; the Perl 6 compilers do not evaluate them as program text.
+readers; the Perl 6 compilers do not evaluate them as program text. They
+are part of the I<non-ambient> code that includes I<Pod 6> text.
 
 Comments count as whitespace in places where the absence or presence of
 whitespace disambiguates possible parses.