Clarifying some comments regarding And predicate

libwccl/ops/and.cpp

-#include "and.h"
+#include <libwccl/ops/and.h>
 
 namespace Wccl {
 

libwccl/ops/and.h

@@ -8,6 +8,9 @@
 
 namespace Wccl {
 
+/**
+ * Operator that realises "and" logical predicate
+ */
 class And : public LogicalPredicate
 {
 public:
@@ -20,8 +23,9 @@ protected :
 	typedef FunctionBase::BaseRetValPtr BaseRetValPtr ;
 
 	/**
-	 * "And" predicate returns True only when all expressions are true,
-	 * otherwise it returns False
+	 * "And" predicate evaluates each expression from left to right,
+     * and returns False once an expression evaluating to False is found.
+     * If all expressions were True, it returns True.
 	 */
 	virtual BaseRetValPtr apply_internal(const SentenceContext&) const;