Improve comments in print-utils.h.

Since I had to look at these function comments to fix the RISC-V ARI warnings,
I noticed that they make no sense.  The pulongest and plongest comments are
swapped.  phex is missing a comment.  And phex_nz doesn't mention how it is
different from phex.

	* gdbsupport/print-utils.h (pulongest): Fix comment.
	(plongest): Likewise.
	(phex): Add missing comment, mention leading zeros.
	(phex_nz): Add mention of no leading zeros to comment.

1 files changed, 7 insertions, 4 deletions

diff --git a/gdb/gdbsupport/print-utils.h b/gdb/gdbsupport/print-utils.h
index 815b14c..d52bcf8 100644
--- a/gdb/gdbsupport/print-utils.h
+++ b/gdb/gdbsupport/print-utils.h
@@ -24,20 +24,23 @@
    cell.  */
 #define PRINT_CELL_SIZE 50
 
-/* %d for LONGEST.  The result is stored in a circular static buffer,
+/* %u for ULONGEST.  The result is stored in a circular static buffer,
    NUMCELLS deep.  */
 
 extern char *pulongest (ULONGEST u);
 
-/* %u for ULONGEST.  The result is stored in a circular static buffer,
+/* %d for LONGEST.  The result is stored in a circular static buffer,
    NUMCELLS deep.  */
 
 extern char *plongest (LONGEST l);
 
+/* Convert a ULONGEST into a HEX string, like %lx, with leading zeros.
+   The result is stored in a circular static buffer, NUMCELLS deep.  */
+
 extern char *phex (ULONGEST l, int sizeof_l);
 
-/* Convert a ULONGEST into a HEX string, like %lx.  The result is
-   stored in a circular static buffer, NUMCELLS deep.  */
+/* Convert a ULONGEST into a HEX string, like %lx, without leading zeros.
+   The result is  stored in a circular static buffer, NUMCELLS deep.  */
 
 extern char *phex_nz (ULONGEST l, int sizeof_l);