Correct UTF8 params documentation further
The latest change misdocumented OSSL_PARAM_get_utf8_string(), that
change should have been for OSSL_PARAM_set_utf8_string().
@@ -241,15 +241,20 @@ will be assigned the size the parameter's I<data> buffer should have.
OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
pointed to by I<p>.
The string is stored into I<*val> with a size limit of I<max_len>,
-which must be large enough to accomodate the string. A terminating NUL byte
-is added only if the buffer is longer than the string length otherwise the
-string will not be NUL terminated.
+which must be large enough to accomodate a terminating NUL byte,
+otherwise this function will fail.
If I<*val> is NULL, memory is allocated for the string (including the
terminating NUL byte) and I<max_len> is ignored.
If memory is allocated by this function, it must be freed by the caller.
OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
by I<p> to the value referenced by I<val>.
+If the parameter's I<data> field isn't NULL, its I<data_size> must indicate
+that the buffer is large enough to accomodate the string that I<val> points at,
+not including the terminating NUL byte, or this function will fail.
+A terminating NUL byte is added only if the parameter's I<data_size> indicates
+the buffer is longer than the string length, otherwise the string will not be
+NUL terminated.
If the parameter's I<data> field is NULL, then only its I<return_size> field
will be assigned the minimum size the parameter's I<data> buffer should have
to accomodate the string, not including a terminating NUL byte.
