STRING_CHAR does not unify characters; update documentation

* src/character.h (STRING_CHAR): Update doc.
* src/buffer.h (FETCH_MULTIBYTE_CHAR): Update doc.  While at it, change
the function to use BYTE_POS_ADDR instead of open-coding it.

1 files changed, 1 insertions, 4 deletions

diff --git a/src/character.h b/src/character.h
index 0d0e31c4c92..7f01bc6a31e 100644
--- a/src/character.h
+++ b/src/character.h
@@ -308,10 +308,7 @@ enum
       }                                                                 \
   } while (false)
 
-/* Return the character code of character whose multibyte form is at
-   P.  Note that this macro unifies CJK characters whose codepoints
-   are in the Private Use Areas (PUAs), so it might return a different
-   codepoint from the one actually stored at P.  */
+/* Return the character code of character whose multibyte form is at P. */
 
 #define STRING_CHAR(p)                                          \
   (!((p)[0] & 0x80)                                             \