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work around jruby-5642 during package installation on jdk11 (elastic#…

…10658)

fixes elastic#10593

Make the sample command easier to follow

A tiny change suggestion due to:

- `-SIGHUP` was mentioned in the previous text
- `-SIGHUP` is easier to read than `-1`
- `-1` can be easily mixed up with `-l`

Fixes elastic#10592

Make the sample command easier to follow

A tiny change suggestion due to:

- `-SIGHUP` was mentioned in the previous text
- `-SIGHUP` is easier to read than `-1`
- `-1` can be easily mixed up with `-l`

Fixes elastic#10592

Add sample doc files to plugin generator

Fixes elastic#10029

Add sample doc files to plugin generator

Fixes elastic#10029