HDDS-6351. [Docs] Update prefix-based FSO documentation.

[JyotinderSingh]

What changes were proposed in this pull request?

The documentation lists out of date information about File System Optimization features.

We no longer recommend using ozone.om.enable.filesystem.paths configuration for enabling File System Optimization. We now have support for bucket layout features to support bucket-specific metadata formats.

Examples of outdated documentation:

LINK

...

Note: This feature works only when ozone.om.enable.filesystem.paths is enabled which means that Hadoop Compatible File System compatibility is favored instead of S3 compatibility. Some irregular S3 key names may be rejected or normalized.

...

By default the feature is disabled. It can be enabled with the following settings in ozone-site.xml:<property>
   <name>ozone.om.enable.filesystem.paths</name>
   <value>true</value>
</property>
<property>
   <name>ozone.om.metadata.layout</name>
   <value>PREFIX</value>
</property>

...

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-6351

How was this patch tested?

NA

[rakeshadr]

+1 LGTM. Thanks @JyotinderSingh for the contribution.