[doc] update totalRecordCount and deltaRecordCount in understand-files.md

[wpj980205]

Search before asking

• [X] I searched in the issues and found nothing similar.

Motivation

the snapshot json in Compact Table part should be updated, because of the commit in org.apache.paimon.operation.FileStoreCommitImpl.

Solution

before:

{
  "version" : 3,
  "id" : 4,
  "schemaId" : 0,
  "baseManifestList" : "manifest-list-9be16-82e7-4941-8b0a-7ce1c1d0fa6d-0",
  "deltaManifestList" : "manifest-list-9be16-82e7-4941-8b0a-7ce1c1d0fa6d-1",
  "changelogManifestList" : null,
  "commitUser" : "a3d951d5-aa0e-4071-a5d4-4c72a4233d48",
  "commitIdentifier" : 9223372036854775807,
  "commitKind" : "COMPACT",
  "timeMillis" : 1684163217960,
  "logOffsets" : { },
  "totalRecordCount" : 38,
  "deltaRecordCount" : 20,
  "changelogRecordCount" : 0,
  "watermark" : -9223372036854775808
}

after:

{
  "version" : 3,
  "id" : 4,
  "schemaId" : 0,
  "baseManifestList" : "manifest-list-9be16-82e7-4941-8b0a-7ce1c1d0fa6d-0",
  "deltaManifestList" : "manifest-list-9be16-82e7-4941-8b0a-7ce1c1d0fa6d-1",
  "changelogManifestList" : null,
  "commitUser" : "a3d951d5-aa0e-4071-a5d4-4c72a4233d48",
  "commitIdentifier" : 9223372036854775807,
  "commitKind" : "COMPACT",
  "timeMillis" : 1684163217960,
  "logOffsets" : { },
  "totalRecordCount" : 2,
  "deltaRecordCount" : -16,
  "changelogRecordCount" : 0,
  "watermark" : -9223372036854775808
}

Anything else?

No response

Are you willing to submit a PR?

• [X] I'm willing to submit a PR!

[dbac]

@wpj980205 I'm willing to submit a PR! do modify the content in the document and replace it according to the above content? the path is