refactor(rpc): change struct from "TxPoolVerbosity" to "TxPoolEntries…

[chanhsu001]

Change "TxPoolVerbosity" to "TxPoolEntries", Change "TxVerbosity" to "TxPoolEntry"
for clear expressed, avoid ambiguity

What problem does this PR solve?

the word "TxPoolVerbosity", and "TxVerbosity" is ambiguous to used in the function/code
change them to "TxPoolEntries", and "TxPoolEntry", more clearly expressed.

Problem Summary:

What is changed and how it works?

change word in rpc/. and util/jsonrpc-types/.., run make gen-rpc-doc to update RPC readme

What's Changed:

Related changes

• PR to update owner/repo:
• Need to cherry-pick to the release branch

Tests

• No code (skip ci)
  already make ci pass

Side effects

Release note

None: Exclude this PR from the release note.

[yangby-cryptape]

These are BREAK CHANGES. This PR should have an release note.

And also this PR shouldn't be No code (skip ci).

[yangby-cryptape]

I misunderstood at first. These are not break changes.

[chanhsu001]

bors merge=doitian,quake

[bors]

Build succeeded:

• ci