vsnprintf: remove duplicate comment of vsnprintf

Remove the duplicate comment of bstr_printf that is the same as the
vsnprintf.

Add the 's' option to the comment for the pointer function. This is
more of an internal function so the little duplication of the comment
here is OK.
Reported-by: Zhaolei <zhaolei@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

lib/vsprintf.c

@@ -794,7 +794,8 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
  *
  * - 'F' For symbolic function descriptor pointers with offset
  * - 'f' For simple symbolic function names without offset
- * - 'S' For symbolic direct pointers
+ * - 'S' For symbolic direct pointers with offset
+ * - 's' For symbolic direct pointers without offset
  * - 'R' For a struct resource pointer, it prints the range of
  *       addresses (not the name nor the flags)
  * - 'M' For a 6-byte MAC address, it prints the address in the
@@ -1069,6 +1070,7 @@ static int format_decode(const char *fmt, struct printf_spec *spec)
  * %pF output the name of a function pointer with its offset
  * %pf output the name of a function pointer without its offset
  * %pR output the address range in a struct resource
+ * %n is ignored
  *
  * The return value is the number of characters which would
  * be generated for the given input, excluding the trailing
@@ -1524,11 +1526,7 @@ EXPORT_SYMBOL_GPL(vbin_printf);
  * a binary buffer that generated by vbin_printf.
  *
  * The format follows C99 vsnprintf, but has some extensions:
- * %pS output the name of a text symbol
- * %pF output the name of a function pointer with its offset
- * %pf output the name of a function pointer without its offset
- * %pR output the address range in a struct resource
- * %n is ignored
+ *  see vsnprintf comment for details.
  *
  * The return value is the number of characters which would
  * be generated for the given input, excluding the trailing