review fixes: chroot flags, dry-run usage, plugin-init example

[mmatczuk]

Review fixes for #1608:

• rpk-connect-agent-run.adoc: add Linux-only --chroot and --chroot-passthrough flags
• rpk-connect-dry-run.adoc: fix Usage line from [command options] to [OPTIONS] [files...]
• rpk-connect-plugin-init.adoc: add Example section

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[mfernest]

Per our style guide, we avoid possessive prefixes like my- in examples. Would ./example-plugin or similar work here instead?