docs: Special-case function-pointer parameters in kernel-doc

Add yet another regex to kernel-doc to trap @param() references separately
and not produce corrupt RST markup.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

scripts/kernel-doc

@@ -212,6 +212,7 @@ my $anon_struct_union = 0;
 my $type_constant = '\%([-_\w]+)';
 my $type_func = '(\w+)\(\)';
 my $type_param = '\@(\w+)';
+my $type_fp_param = '\@(\w+)\(\)';  # Special RST handling for func ptr params
 my $type_struct = '\&((struct\s*)*[_\w]+)';
 my $type_struct_xml = '\\&((struct\s*)*[_\w]+)';
 my $type_env = '(\$\w+)';
@@ -292,6 +293,7 @@ my @highlights_rst = (
                        # Note: need to escape () to avoid func matching later
                        [$type_member_func, "\\:c\\:type\\:`\$1\$2\\\\(\\\\) <\$1>`"],
                        [$type_member, "\\:c\\:type\\:`\$1\$2 <\$1>`"],
+		       [$type_fp_param, "**\$1\\\\(\\\\)**"],
                        [$type_func, "\\:c\\:func\\:`\$1()`"],
                        [$type_struct_full, "\\:c\\:type\\:`\$1 \$2 <\$2>`"],
                        [$type_enum_full, "\\:c\\:type\\:`\$1 \$2 <\$2>`"],