Wrong documentation for conditions

### Describe the bug

--condition "avg Percentage CPU > 90" --window-size 5m --evaluation-frequency 1m \ is wrong.
It should be adjusted to:
--condition "avg CpuPercentage > 90" --window-size 5m --evaluation-frequency 1m \.
I have seen this syntax error in multiple documentation pages about az monitor metrics alert.

### Related command

az monitor metrics alert

### Errors

If typed into the CLI:
(BadRequest) Couldn't find a metric named Percentage CPU. Make sure the name is correct.
Code: BadRequest

### Issue script & Debug output

(BadRequest) Couldn't find a metric named Percentage CPU. Make sure the name is correct.
Code: BadRequest

### Expected behavior

Adjusted documentation.

### Environment Summary

azure-cli 2.50.0

core 2.50.0
telemetry 1.0.8

Extensions:
ai-examples 0.2.5
ml 2.18.0
ssh 1.1.6

Dependencies:
msal 1.22.0
azure-mgmt-resource 23.1.0b2

### Additional context

_No response_