Revise CONTRIBUTING.md contents

[woofyzhao]

Signed-off-by: woofyzhao 490467089@qq.com

Issue Number: close #14031

What's Changed:

• Explicitly mention protoc as one of the prerequisites to build tikv in doc.
• Fix some typo in doc.
• Fix dead hyper links.

Release note
NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• YuJuncen
• zz-jason

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[ti-chi-bot]

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[woofyzhao]

/release-note-none

[woofyzhao]

/check-issue-triage-complete

[woofyzhao]

/cc @3pointer
/cc @BusyJay
/cc @zz-jason

[zz-jason]

LGTM

[BusyJay]

We have drop the dependency long time ago, I believe it's introduced back because of etcd-client. /cc @YuJuncen

[YuJuncen]

Yes, more preciously it is prost that brings this requirement. After PD exposing some of the operations over the etcd key space in pdpb, I guess we would be able to remove the requirement of etcd soon.

[woofyzhao]

/cc @YuJuncen

[YuJuncen]

LGTM (Sorry for the delay...)

[BusyJay]

/merge

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This pull request has been accepted and is ready to merge.

Commit hash: c064693

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@woofyzhao: Your PR was out of date, I have automatically updated it for you.

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