C#: Update some of the QL docs.

csharp/ql/lib/semmle/code/csharp/exprs/ArithmeticOperation.qll

@@ -24,14 +24,14 @@ class BinaryArithmeticOperation extends ArithmeticOperation, BinaryOperation, @b
 }
 
 /**
- * A unary arithmetic operation. Either a unary minus operation
- * (`UnaryMinusExpr`), a unary plus operation (`UnaryPlusExpr`),
+ * A unary arithmetic operation. Either a unary minus expression
+ * (`UnaryMinusExpr`), a unary plus expression (`UnaryPlusExpr`),
  * or a mutator operation (`MutatorOperation`).
  */
 class UnaryArithmeticOperation extends ArithmeticOperation, UnaryOperation, @un_arith_operation { }
 
 /**
- * A unary minus operation, for example `-x`.
+ * A unary minus expression, for example `-x`.
  */
 class UnaryMinusExpr extends UnaryArithmeticOperation, @minus_expr {
   override string getOperator() { result = "-" }
@@ -40,7 +40,7 @@ class UnaryMinusExpr extends UnaryArithmeticOperation, @minus_expr {
 }
 
 /**
- * A unary plus operation, for example `+x`.
+ * A unary plus expression, for example `+x`.
  */
 class UnaryPlusExpr extends UnaryArithmeticOperation, @plus_expr {
   override string getOperator() { result = "+" }
@@ -55,37 +55,37 @@ class UnaryPlusExpr extends UnaryArithmeticOperation, @plus_expr {
 class MutatorOperation extends UnaryArithmeticOperation, @mut_operation { }
 
 /**
- * An increment operation. Either a postfix increment operation
- * (`PostIncrExpr`) or a prefix increment operation (`PreIncrExpr`).
+ * An increment operation. Either a postfix increment expression
+ * (`PostIncrExpr`) or a prefix increment expression (`PreIncrExpr`).
  */
 class IncrementOperation extends MutatorOperation, @incr_operation {
   override string getOperator() { result = "++" }
 }
 
 /**
- * A decrement operation. Either a postfix decrement operation
- * (`PostDecrExpr`) or a prefix decrement operation (`PreDecrExpr`).
+ * A decrement operation. Either a postfix decrement expression
+ * (`PostDecrExpr`) or a prefix decrement expression (`PreDecrExpr`).
  */
 class DecrementOperation extends MutatorOperation, @decr_operation {
   override string getOperator() { result = "--" }
 }
 
 /**
- * A prefix increment operation, for example `++x`.
+ * A prefix increment expression, for example `++x`.
  */
 class PreIncrExpr extends IncrementOperation, @pre_incr_expr {
   override string getAPrimaryQlClass() { result = "PreIncrExpr" }
 }
 
 /**
- * A prefix decrement operation, for example `--x`.
+ * A prefix decrement expression, for example `--x`.
  */
 class PreDecrExpr extends DecrementOperation, @pre_decr_expr {
   override string getAPrimaryQlClass() { result = "PreDecrExpr" }
 }
 
 /**
- * A postfix increment operation, for example `x++`.
+ * A postfix increment expression, for example `x++`.
  */
 class PostIncrExpr extends IncrementOperation, @post_incr_expr {
   override string toString() { result = "..." + this.getOperator() }
@@ -94,7 +94,7 @@ class PostIncrExpr extends IncrementOperation, @post_incr_expr {
 }
 
 /**
- * A postfix decrement operation, for example `x--`.
+ * A postfix decrement expression, for example `x--`.
  */
 class PostDecrExpr extends DecrementOperation, @post_decr_expr {
   override string toString() { result = "..." + this.getOperator() }
@@ -142,7 +142,7 @@ class RemOperation extends BinaryArithmeticOperation, @rem_operation { }
 class BinaryArithmeticExpr extends BinaryArithmeticOperation, @bin_arith_expr { }
 
 /**
- * An addition operation, for example `x + y`.
+ * An addition expression, for example `x + y`.
  */
 class AddExpr extends BinaryArithmeticExpr, AddOperation, @add_expr {
   override string getOperator() { result = "+" }
@@ -151,7 +151,7 @@ class AddExpr extends BinaryArithmeticExpr, AddOperation, @add_expr {
 }
 
 /**
- * A subtraction operation, for example `x - y`.
+ * A subtraction expression, for example `x - y`.
  */
 class SubExpr extends BinaryArithmeticExpr, SubOperation, @sub_expr {
   override string getOperator() { result = "-" }
@@ -160,7 +160,7 @@ class SubExpr extends BinaryArithmeticExpr, SubOperation, @sub_expr {
 }
 
 /**
- * A multiplication operation, for example `x * y`.
+ * A multiplication expression, for example `x * y`.
  */
 class MulExpr extends BinaryArithmeticExpr, MulOperation, @mul_expr {
   override string getOperator() { result = "*" }
@@ -169,7 +169,7 @@ class MulExpr extends BinaryArithmeticExpr, MulOperation, @mul_expr {
 }
 
 /**
- * A division operation, for example `x / y`.
+ * A division expression, for example `x / y`.
  */
 class DivExpr extends BinaryArithmeticExpr, DivOperation, @div_expr {
   override string getOperator() { result = "/" }
@@ -178,7 +178,7 @@ class DivExpr extends BinaryArithmeticExpr, DivOperation, @div_expr {
 }
 
 /**
- * A remainder operation, for example `x % y`.
+ * A remainder expression, for example `x % y`.
  */
 class RemExpr extends BinaryArithmeticExpr, RemOperation, @rem_expr {
   override string getOperator() { result = "%" }