adding powershell escaping note

docs/features/command-line/powershell-examples.md

@@ -7,6 +7,10 @@ When you combine `dscmd.exe` with powershell you can do some really powerful thi
 # Example 1
 The following example loops through an array of characters and export rows where the 'Product'[Color] value starts with the specified letter. This shows how you can insert a variable from Powershell into your query and filename dynamically.
 
+:::tip
+Note that double quote characters `"` inside 'here strings' `@"..."@` need to be double escaping using a backslash and a backtick eg  `` \`" ``
+:::
+
 ```
 $cmd = "C:\Users\dgosbell\Downloads\DaxStudio_3_1_0_portable\dscmd.exe"
 $server = "localhost:50909"