C#: Address review comments.

Author: michaelnebel

csharp/ql/test/library-tests/stringinterpolation/stringInterpolation.ql

@@ -1,11 +1,9 @@
 import csharp
 
-query predicate inserts(InterpolatedStringExpr expr, Expr e) {
-  expr.getAnInsert() = e // and inSpecificSource(expr)
-}
+query predicate inserts(InterpolatedStringExpr expr, Expr e) { expr.getAnInsert() = e }
 
 query predicate texts(InterpolatedStringExpr expr, StringLiteral literal) {
-  expr.getAText() = literal // and inSpecificSource(expr)
+  expr.getAText() = literal
 }
 
 query predicate interpolationInsertsWithAlign(InterpolatedStringExpr expr, Expr insert, Expr align) {