Reword $?ENC meaning.

Author: fluca1978

doc/Language/variables.pod6

@@ -1084,7 +1084,7 @@ X<|$?GRAMMAR>X<|$?TABSTOP>X<|$?NL>X<|$?ENC>
     $?GRAMMAR   Which grammar am I in?
     $?TABSTOP   How many spaces is a tab in a heredoc or virtual margin?
     $?NL        What a vertical newline "\n" means: LF, CR or CRLF
-    $?ENC       Default encoding of Str.encode/Buf.decode/various IO methods.
+    $?ENC       Default encoding of various IO methods, e.g., Str.encode, Buf.decode
 
 With particular regard to the C<$?NL>, see the  L<newline pragma|/language/pragmas>.