Wdocumentation error during grpc ios compile

[HannahShiSFB]

the logs are as follow:

../../../../../../third_party/xxhash/xxhash.h:1916:11: error: parameter 'input,' not found in the function declaration [-Werror,-Wdocumentation]

• @param input, len, seed Directly passed from @ref XXH32().
  ^~~~~~
  ../../../../../../third_party/xxhash/xxhash.h:1916:11: note: did you mean 'input'?
• @param input, len, seed Directly passed from @ref XXH32().
  ^~~~~~
  input
  ../../../../../../third_party/xxhash/xxhash.h:3104:11: error: parameter 'lhs,' not found in the function declaration [-Werror,-Wdocumentation]
• @param lhs, rhs The 64-bit integers to be multiplied
  ^~~~
  ../../../../../../third_party/xxhash/xxhash.h:3104:11: note: did you mean 'lhs'?
• @param lhs, rhs The 64-bit integers to be multiplied
  ^~~~
  lhs
  ../../../../../../third_party/xxhash/xxhash.h:3222:11: error: parameter 'lhs,' not found in the function declaration [-Werror,-Wdocumentation]
• @param lhs, rhs The 64-bit integers to multiply
  ^~~~
  ../../../../../../third_party/xxhash/xxhash.h:3222:11: note: did you mean 'lhs'?
• @param lhs, rhs The 64-bit integers to multiply
  ^~~~
  lhs
  3 errors generated.

[Cyan4973]

cc @easyaspi314 .

I see the -Wdocumentation compiler warning,
but I'm not sure what to do.
It seems to complain that some parameter is not found in the function declaration,
but the parameter is definitely present.

[t-mat]

xxhash.h:1916:11: error: parameter 'input,' not found in the function declaration [-Werror,-Wdocumentation]

It seems extra , causes this error. After the argument name, we should place explicit space/tab to avoid this error. For example

- * @param input, len, ...
+ * @param input , len, ...

[Cyan4973]

Thanks @t-mat ! This seems to fix it perfectly !