The wire_format_lite_inl.h header file was made unnecessary in #5839
and deleted in #5921, so remove the comment about it.

Update CONTRIBUTING.md to clarify who should set the labels

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release notes: no

I'm getting `src/google/protobuf/map_field.cc(284): error C2899: typename cannot be used outside a template declaration`

removing `typename` fixes the issue

This fixes compatibility with bazel when passing `--incompatible_no_support_tools_in_action_inputs` which will be flipped in an upcoming release.

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Update performance.md

Even though I just proofread this file, I noticed one more thing that needed correcting, which I fixed. The word "genereated" had to be corrected to "generated". My apologies for missing this on the initial check.

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Update performance.md

I corrected a few grammatical mistakes and increased the document's readability by easing the language flow.

Update instruction on how to use JavaLite runtime

Fix typo 'pythong'

Typo fix for conformance test runner.

Revert "Convert Google::Protobuf.deep_copy to pure Ruby"

Convert Google::Protobuf.deep_copy to pure Ruby

Changed 'pythong' to 'python'

Make sure to return the updated line when modifying .pb.h file

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In general, I think it will help us to debug issues if we have less C
code and more Ruby code.  This method can be implemented in pure Ruby,
so this commit converts it to pure Ruby.

This reverts commit a7180caf.