docs: fix description of WatchResponse.canceled

[myrat92]

see description in #18413

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Hi @myrat92. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/wal/repair.go	56.14% <100.00%> (ø)

... and 17 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18580      +/-   ##
==========================================
+ Coverage   68.73%   68.81%   +0.07%     
==========================================
  Files         420      420              
  Lines       35474    35474              
==========================================
+ Hits        24382    24410      +28     
+ Misses       9666     9648      -18     
+ Partials     1426     1416      -10     

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[myrat92]

cc pls @jmhbnz

[jmhbnz]

Thanks @myrat92 this lines up with

etcd/client/v3/watch.go

Lines 54 to 56 in 6c1fe4a

	// Watch watches on a key or prefix. The watched events will be returned
	// through the returned channel. If revisions waiting to be sent over the
	// watch are compacted, then the watch will be canceled by the server, the

/ok-to-test

We should ensure website docs pages also reflect this, I think some of them may auto generate:

• https://etcd.io/docs/v3.5/learning/api/#watch-streams
• https://etcd.io/docs/v3.5/dev-guide/api_reference_v3/

@serathius, @ahrtr can you please also take a look at this, thanks!

[ahrtr]

The Documentation/dev-guide/apispec/swagger/rpc.swagger.json is automatically generated based on proto file

etcd/api/etcdserverpb/rpc.proto

Lines 839 to 841 in 6c1fe4a

	// canceled is set to true if the response is for a cancel watch request.
	// No further events will be sent to the canceled watcher.
	bool canceled = 4;

Refer to https://github.com/etcd-io/etcd/blob/main/scripts/genproto.sh