Automatic merge from submit-queue

examples: PV docs clarify Azure storage account restriction

**What this PR does / why we need it**: One line doc fix, clarifies a constraint for using `AzureDisk` volumes.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #40276

**Special notes for your reviewer**: None

**Release note**:

```release-note
NONE
```

cc: @rootfs @otaviosoares