kernel-doc: extend $type_param to match members referenced by pointer

Currently, function parameter description can match '@type.member' expressions
but fails to match '@type->member'.  Extend the $type_param regex to allow
matching both

- https://lore.kernel.org/patchwork/patch/1007904/

Reported-by:  Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Author: return42

linuxdoc/kernel_doc.py

@@ -176,7 +176,7 @@ def __getitem__(self, group):
 type_member_func  = RE(type_member.pattern + r"\(\)")
 type_func         = RE(r"(?<=\s)(\w+)(?<!\\)\(\)")
 type_constant     = RE(r"(?<=\s)\%([-_\w]+)")
-type_param        = RE(r"(?<=\s)\@(\w*(\.\w+)*(\.\.\.)?)")
+type_param        = RE(r"(?<=\s)\@(\w*((\.\w+)|(->\w+))*(\.\.\.)?)")
 type_env          = RE(r"(?<=\s)(\$\w+)")
 type_struct       = RE(r"(?<=\s)\&((struct\s*)*[_\w]+)")