Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine blockade/net.py and observe targetting, however expect to see targeting.
• Examine blockade/state.py and observe specificed, however expect to see specified.
• Examine blockade/net.py and observe refererences, however expect to see references.
• Examine docs/config.rst and observe contrainer, however expect to see container.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR. Alternatively if the fix is undesired please
close the issue with a small comment about the reasoning.

https://github.com/timgates42/blockade/pull/new/bugfix_typos

Thanks.