Merge pull request #174973 from anastasia-ms/edgedeploy

Edge Devices: Clarify restrictions for target condition keys

Author: PRMerger15

articles/iot-edge/module-deployment-monitoring.md

@@ -75,6 +75,7 @@ Consider these constraints when you construct a target condition:
 * Double quotes aren't allowed in any portion of the target condition. Use single quotes.
 * Single quotes represent the values of the target condition. Therefore, you must escape the single quote with another single quote if it's part of the device name. For example, to target a device called `operator'sDevice`, write `deviceId='operator''sDevice'`.
 * Numbers, letters, and the following characters are allowed in target condition values: `-:.+%_#*?!(),=@;$`.
+* The following characters are not allowed in target condition keys:`/;`.
 
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