Rust: Add + clean up some QLDoc.

Author: geoffw0

rust/ql/lib/codeql/rust/elements/AssignmentOperation.qll

@@ -1,16 +1,23 @@
-/** Provides classes for assignment operations. */
+/**
+ * Provides classes for assignment operations.
+ */
 
 private import rust
 private import codeql.rust.elements.internal.BinaryExprImpl
 
-/** An assignment operation. */
+/**
+ * An assignment operation, for example:
+ * ```rust
+ * x = y;
+ * x += y;
+ * ```
+ */
 abstract private class AssignmentOperationImpl extends Impl::BinaryExpr { }
 
 final class AssignmentOperation = AssignmentOperationImpl;
 
 /**
- * An assignment expression, for example
- *
+ * An assignment expression, for example:
  * ```rust
  * x = y;
  * ```
@@ -22,8 +29,7 @@ final class AssignmentExpr extends AssignmentOperationImpl {
 }
 
 /**
- * A compound assignment expression, for example
- *
+ * A compound assignment expression, for example:
  * ```rust
  * x += y;
  * ```

rust/ql/lib/codeql/rust/elements/LogicalOperation.qll

@@ -2,30 +2,48 @@ private import codeql.rust.elements.Expr
 private import codeql.rust.elements.BinaryExpr
 private import codeql.rust.elements.PrefixExpr
 
+/**
+ * A logical operation, such as `&&`, `||` or `!`.
+ */
 abstract private class LogicalOperationImpl extends Expr {
   abstract Expr getAnOperand();
 }
 
 final class LogicalOperation = LogicalOperationImpl;
 
+/**
+ * A binary logical operation, such as `&&` or `||`.
+ */
 abstract private class BinaryLogicalOperationImpl extends BinaryExpr, LogicalOperationImpl {
   override Expr getAnOperand() { result = [this.getLhs(), this.getRhs()] }
 }
 
 final class BinaryLogicalOperation = BinaryLogicalOperationImpl;
 
+/**
+ * The logical and operation, `&&`.
+ */
 final class LogicalAndExpr extends BinaryLogicalOperationImpl, BinaryExpr {
   LogicalAndExpr() { this.getOperatorName() = "&&" }
 }
 
+/**
+ * The logical or operation, `||`.
+ */
 final class LogicalOrExpr extends BinaryLogicalOperationImpl {
   LogicalOrExpr() { this.getOperatorName() = "||" }
 }
 
+/**
+ * A unary logical operation, such as `!`.
+ */
 abstract private class UnaryLogicalOperationImpl extends PrefixExpr, LogicalOperationImpl { }
 
 final class UnaryLogicalOperation = UnaryLogicalOperationImpl;
 
+/**
+ * A logical not operation, `!`.
+ */
 final class LogicalNotExpr extends UnaryLogicalOperationImpl {
   LogicalNotExpr() { this.getOperatorName() = "!" }