fix build warning

Author: BillWagner

standard/expressions.md

@@ -558,8 +558,8 @@ An *argument_list* consists of one or more *argument*s, separated by commas. Eac
 The *argument_value* can take one of the following forms:
 
 - An *expression*, indicating that the argument is passed as a value parameter ([§15.6.2.2](classes.md#15622-value-parameters)).
-- The keyword `ref` followed by a *variable_reference* ([§9.5](variables.md#95-variable-references)), indicating that the argument is passed as a reference parameter ([§15.6.2.3](classes.md#14623-reference-parameters)). A variable shall be definitely assigned ([§9.5](variables.md#94-definite-assignment)) before it can be passed as a reference parameter.
-- The keyword `out`, optionally followed by *local_variable_type* ([§13.6.2](statements.md#1262-local-variable-declarations)), followed by *identifier*, indicating that the argument is passed as an output parameter ([§15.6.2.4](classes.md#15624-output-parameters)). If *identifier* is not a discard (§9.2.8.1), the variable it designates is considered definitely assigned ([§9.4](variables.md#94-definite-assignment)) following a function member invocation in which the variable is passed as an output parameter. In this context, the variable designated by *identifier* is known as an ***out variable***.
+- The keyword `ref` followed by a *variable_reference* ([§9.5](variables.md#95-variable-references)), indicating that the argument is passed as a reference parameter ([§15.6.2.3](classes.md#15623-reference-parameters)). A variable shall be definitely assigned ([§9.4](variables.md#94-definite-assignment)) before it can be passed as a reference parameter.
+- The keyword `out`, optionally followed by *local_variable_type* ([§13.6.2](statements.md#1362-local-variable-declarations)), followed by *identifier*, indicating that the argument is passed as an output parameter ([§15.6.2.4](classes.md#15624-output-parameters)). If *identifier* is not a discard, the variable it designates is considered definitely assigned ([§9.4](variables.md#94-definite-assignment)) following a function member invocation in which the variable is passed as an output parameter. In this context, the variable designated by *identifier* is known as an ***out variable***.
 
 *identifier* denotes a new variable, an existing variable, or a discard depending on the context. Specifically,