broken link to proto version compare

[trivalik]

see

protocolbuffers.github.io/content/programming-guides/proto-limits.md

Line 28 in bedcd7a

[only by proto2](/programming-guides/version-comparison#extensionsany).

the link to https://protobuf.dev/programming-guides/version-comparison#extensionsany

[Logofile]

Not only is it a broken link, but the content is outdated. Extensions were added back in with Editions, so the text should say "Extensions are not supported in proto3."

I will update this. Thanks for raising the issue!

[Logofile]

I've updated the content. Please double-check that this matches your expectations. If there are still issues, please reopen this issue or submit a new one.