C++: QLDoc multiple files in the exprs directory.

cpp/ql/src/semmle/code/cpp/exprs/Access.qll

@@ -1,3 +1,8 @@
+/**
+ * Provides classes for modeling accesses including variable accesses, enum
+ * constant accesses and function accesses.
+ */
+
 import semmle.code.cpp.exprs.Expr
 import semmle.code.cpp.Variable
 import semmle.code.cpp.Enum

cpp/ql/src/semmle/code/cpp/exprs/ArithmeticOperation.qll

@@ -1,3 +1,8 @@
+/**
+ * Provides classes for modeling arithmetic operations such as `+`, `-`, `*`
+ * and `++`.
+ */
+
 import semmle.code.cpp.exprs.Expr
 
 /**

cpp/ql/src/semmle/code/cpp/exprs/BitwiseOperation.qll

@@ -1,3 +1,8 @@
+/**
+ * Provides classes for modeling bitwise operations such as `~`, `<<`, `&` and
+ * `|`.
+ */
+
 import semmle.code.cpp.exprs.Expr
 
 /**

cpp/ql/src/semmle/code/cpp/exprs/BuiltInOperations.qll

@@ -1,7 +1,12 @@
+/**
+ * Provides classes for modeling built-in operations.  Built-in operations are
+ * typically compiler specific and are used by libraries and generated code.
+ */
+
 import semmle.code.cpp.exprs.Expr
 
 /**
- * A C/C++ builtin operation. This is the root QL class encompassing
+ * A C/C++ built-in operation. This is the root QL class encompassing
  * built-in functionality.
  */
 class BuiltInOperation extends Expr, @builtin_op {

cpp/ql/src/semmle/code/cpp/exprs/Call.qll

@@ -1,3 +1,9 @@
+/**
+ * Provides classes for modeling call expressions including direct calls to
+ * functions, constructor and destructor calls, and calls made through function
+ * pointers.
+ */
+
 import semmle.code.cpp.exprs.Expr
 import semmle.code.cpp.Function
 private import semmle.code.cpp.dataflow.EscapesTree

cpp/ql/src/semmle/code/cpp/exprs/ComparisonOperation.qll

@@ -1,3 +1,7 @@
+/**
+ * Provides classes for modeling comparisons such as `==`, `!=` and `<`.
+ */
+
 import semmle.code.cpp.exprs.Expr
 
 /**

cpp/ql/src/semmle/code/cpp/exprs/Expr.qll

@@ -1,3 +1,7 @@
+/**
+ * Provides classes modeling C/C++ expressions.
+ */
+
 import semmle.code.cpp.Element
 private import semmle.code.cpp.Enclosing
 private import semmle.code.cpp.internal.ResolveClass

cpp/ql/src/semmle/code/cpp/exprs/Lambda.qll

@@ -1,3 +1,7 @@
+/**
+ * Provides classes for modeling lambda expressions and their captures.
+ */
+
 import semmle.code.cpp.exprs.Expr
 import semmle.code.cpp.Class
 

cpp/ql/src/semmle/code/cpp/exprs/LogicalOperation.qll

@@ -1,3 +1,8 @@
+/**
+ * Provides classes for modeling logical operations such as `!`, `&&`, `||`, and
+ * the ternary `? :` expression.
+ */
+
 import semmle.code.cpp.exprs.Expr
 
 /**