unified: Fix some typos in comments

Author: asgerf

unified/ql/lib/codeql/unified/internal/LocalNameBinding.qll

@@ -475,7 +475,7 @@ class PotentialLocalNameAccess extends IdentifierExpr {
   predicate isBindingSite() { this instanceof NameBinding }
 }
 
-/** Gets implicitly-declared variable through which the given callable refers to its receiver. */
+/** Gets the implicitly-declared variable through which the given callable refers to its receiver. */
 LocalVariable getImplicitReceiverVariable(Callable callable) {
   exists(string name |
     name = any(NameBindingPlugin p).getImplicitReceiverParameterName(callable) and

unified/ql/lib/codeql/unified/internal/dataflow/DataFlowCall.qll

@@ -17,7 +17,7 @@ class DataFlowCall extends TDataFlowCall {
   /** Gets the `CallExpr` wrapped by this dataflow call, if any. */
   CallExpr asExplicitCall() { this = TExplicitCall(result) }
 
-  /** Gets a string representation of this call. */
+  /** Gets a textual representation of this call. */
   string toString() { result = this.asExplicitCall().toString() }
 
   /** Gets the location of this call, if any. */