chore(docs): azure devops variable name inconsistency

[demetriusmoro]

Syncing doc environment variable name with the current code, as seen here (2022-12-30): https://github.com/demetriusmoro/atlantis/blob/main/cmd/server.go#L178

• Current var name in the doc (wrong): ATLANTIS_AZUREDEVOPS_BASIC_AUTH
• Current var name in code (correct): ATLANTIS_AZUREDEVOPS_WEBHOOK_PASSWORD

what

Fixing a variable name typo in the docs, to make it same than the actual code that reads this parameter.

why

The current variable name in the docs is not an actual valid parameter, people reading just the docs will get confused.

tests

Doesn't actually have test, its is a doc-only related fix, the related code works as expected.

references

• Code that actually reads the parameter: https://github.com/demetriusmoro/atlantis/blob/main/cmd/server.go
• Direct link to the variable declaration: https://github.com/demetriusmoro/atlantis/blob/main/cmd/server.go#L42
• Direct link to the row with the correct environment variable name, as in 2022-12-30: https://github.com/demetriusmoro/atlantis/blob/main/cmd/server.go#L178

[nitrocode]

Nice find. Seems like a reasonable change. Please feel free to propose more doc changes. They need more TLC.