[HDFS-13427] Fix the section titles of transparent encryption document

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.10.0, 2.9.1, 2.8.4, 3.2.0, 3.1.1, 3.0.3
• Component/s: documentation
• Assignee: Akira Ajisaka
• Reporter: Akira Ajisaka
• Created: 11/Apr/18 11:23
• Updated: 12/Apr/18 02:02
• Resolved: 12/Apr/18 01:51

Description

The `crypto` command before Hadoop 2.8.0 does not provision the `.Trash` directory automatically. If an encryption zone is created before Hadoop 2.8.0, and then the cluster is upgraded to Hadoop 2.8.0 or above, the trash directory can be provisioned using `-provisionTrash` option (e.g., `hdfs crypto -provisionTrash -path /zone`).
<a name="Attack_vectors"></a>Attack vectors
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The long sentence starts with 'The crypto' wrongly become the title. We need to add a blank line between the sentence and 'Attack vectors' to fix this.