[HUDI-9791][DOCS] Update HFile format for compatibility with HBase

[linliu-code]

Change Logs

After we made some changes for backward compatibility with HBase hfile reader, we update the file format accordingly.

Impact

More accurate on file format description.

Risk level (write none, low medium or high below)

None.

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change. If not, put "none".

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the
  ticket number here and follow the instruction to make
  changes to the website.

Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed

[hudi-bot]

CI report:

• a2a8cc0 UNKNOWN
• 71f5245 Azure: SUCCESS

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