ice: remove return value comment for ice_reset_all_vfs

Since commit fe99d1c06c16 ("ice: make ice_reset_all_vfs void"), the
ice_reset_all_vfs function has not returned anything. The function comment
still indicated it did. Fix this.

While here, also add a line to clarify the function resets all VFs at once
in response to hardware resets such as a PF reset.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_vf_lib.c

@@ -359,12 +359,12 @@ ice_vf_clear_vsi_promisc(struct ice_vf *vf, struct ice_vsi *vsi, u8 promisc_m)
  * ice_reset_all_vfs - reset all allocated VFs in one go
  * @pf: pointer to the PF structure
  *
+ * Reset all VFs at once, in response to a PF or other device reset.
+ *
  * First, tell the hardware to reset each VF, then do all the waiting in one
  * chunk, and finally finish restoring each VF after the wait. This is useful
  * during PF routines which need to reset all VFs, as otherwise it must perform
  * these resets in a serialized fashion.
- *
- * Returns true if any VFs were reset, and false otherwise.
  */
 void ice_reset_all_vfs(struct ice_pf *pf)
 {