Updated the Azure CPI config docs to include new and existing features related to the following Azure CPI PRs/issues:
Updated the Azure CPI config docs to include new and existing features related to the following Azure CPI PRs/issues:

- https://github.com/cloudfoundry/bosh-azure-cpi-release/pull/651 (Fixes https://github.com/cloudfoundry/bosh-azure-cpi-release/issues/644)
- https://github.com/cloudfoundry/bosh-azure-cpi-release/pull/541 (Fixed https://github.com/cloudfoundry/bosh-azure-cpi-release/issues/328)
- https://github.com/cloudfoundry/bosh-azure-cpi-release/pull/638 (Fixed https://github.com/cloudfoundry/bosh-azure-cpi-release/issues/111)

Note: This commit assumes that PR #651 will be included in a new `v37.7.0` release of the Azure CPI (in order to properly document the CPI version requirements of new features). If PR #651 is included in a different CPI version, then this PR will need to be amended appropriately.

cloudfoundry/docs-bosh