* Improve content performance of Key Vault configuration provider doc
* Updates to code samples
* React to Acrolinx feedback
* Character encoding test
* Encode more characters
* Revert character encoding
* More edits
* Update README files for sample apps
* More edits
* Minor edits
* Edit pass
* Updated KeyVaultConfiguration
* Updated highlighted code
* Remove old API reference Documentation about AddAzureKeyVault()
* Updated pacakage, without extra removals.
* Add back 'Use a key name prefix' part, replace IKeyVaultSecretManager with KeyVaultSecretManager
* Update PrefixKeyVaultSecretManager
* Correct the name space.
Co-authored-by: Frank Li (Wicresoft North America Ltd) <v-cheli@microsoft.com>
Scott Addie
Frank(MSFT)
Luke Latham