Fix grammar in password
Fix note about video length

Perhaps due to update mentioned at /resources page, the video is 34
minutes long.
Adding new playbook objects for v2

* Playbook
* TaskInclude
Fix path to the integration tests

"tests/integration" -> "test/integration"
Merge pull request #9500 from alexandershov/devel

Fix path to the integration tests in docsite
add documentation for the delegate_to magic variable
Merge pull request #9502 from nikut/delegate_docfix

add documentation for the delegate_to magic variable
changed examples to not have a  non working variable that gets confused
with directives as per #9264
Merge pull request #9503 from bcoca/doc_fix_uservar

changed examples to not have a  non working variable
added error handling on private key stat in case it is saved in agent
but not in filesystem
Merge pull request #9509 from bcoca/no_ssh_fail_missing_keyfile

added error handling on private key stat in case it is saved in agent
fixed ssh fix, bad test case but it should work now
Merge pull request #9510 from bcoca/ssh_agent_wo_keyfile

fixed ssh fix, bad test case but it should work now
Fix rax_find_loadbalancer issues

* Loadbalancer IDs are not UUIDs
* Ensure found list exists before using it
Merge pull request #9511 from sivel/rax-lb-fixes

Fix rax_find_loadbalancer issues
Move from md5 to sha1 to work on fips-140 enabled systems
Fix integration test to check for checksum, not md5sum
Merge pull request #9495 from AloisMahdal/longer_vid

Fix note about video length
Adding v2 task/block iterator and some reorganizing
Fixed 404-link for Michael DeHaan profile page.