fix test

tests/fsharpqa/Source/Warnings/SuggestToUseIndexer.fs

 // #Warnings
-//<Expects status="Error" span="(7,9)" id="FS3217">This value is not a function and cannot be applied. Did you intend to access the indexer via d.[index] instead?</Expects>
+//<Expects status="Error" span="(7,9)" id="FS3217">This value is not a function and cannot be applied. Did you intend to access the indexer via d.\[index\] instead?</Expects>
 //<Expects status="Error" span="(9,9)" id="FS0003">This value is not a function and cannot be applied.$</Expects>
-//<Expects status="Error" span="(12,10)" id="FS3217">This value is not a function and cannot be applied. Did you intend to access the indexer via expr.[index] instead?"</Expects>
+//<Expects status="Error" span="(12,10)" id="FS3217">This expression is not a function and cannot be applied. Did you intend to access the indexer via expr.\[index\] instead?</Expects>
 
 let d = [1,1] |> dict
 let y = d[1]