net: filter: minor: fix kdoc in __sk_run_filter

This minor patch fixes the following warning when doing
a `make htmldocs`:

  DOCPROC Documentation/DocBook/networking.xml
Warning(.../net/core/filter.c:135): No description found for parameter 'insn'
Warning(.../net/core/filter.c:135): Excess function parameter 'fentry' description in '__sk_run_filter'
  HTML    Documentation/DocBook/networking.html

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/filter.c

@@ -125,10 +125,10 @@ noinline u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
 /**
  *	__sk_run_filter - run a filter on a given context
  *	@ctx: buffer to run the filter on
- *	@fentry: filter to apply
+ *	@insn: filter to apply
  *
  * Decode and apply filter instructions to the skb->data. Return length to
- * keep, 0 for none. @ctx is the data we are operating on, @filter is the
+ * keep, 0 for none. @ctx is the data we are operating on, @insn is the
  * array of filter instructions.
  */
 unsigned int __sk_run_filter(void *ctx, const struct sock_filter_int *insn)