Restore correct use of subjunctive

Author: rjmccall

proposals/0382-expression-macros.md

@@ -185,7 +185,7 @@ macro-expansion-expression -> '#' identifier generic-argument-clause[opt] functi
 
 The `#` syntax for macro expansion expressions was specifically chosen because Swift already contains a number of a `#`-prefixed expressions that are macro-like in nature, some of which could be implemented directly as expression macros. The macro referenced by the `identifier` must be an expression macro, as indicated by `@freestanding(expression)` on the corresponding macro declaration.
 
-Both `function-call-argument-clause` and `trailing-closures` are optional. When both are omitted, the macro is expanded as-if the empty argument list `()` was provided. Macros are not first-class entities in the way functions are, so they cannot be passed around as values and do not need an "unapplied macro" syntax. This allows `#line` et al to be macros without requiring them to be written as `#line()`. There is some precedent for this with property wrappers, which will also be used for attached macros.
+Both `function-call-argument-clause` and `trailing-closures` are optional. When both are omitted, the macro is expanded as-if the empty argument list `()` were provided. Macros are not first-class entities in the way functions are, so they cannot be passed around as values and do not need an "unapplied macro" syntax. This allows `#line` et al to be macros without requiring them to be written as `#line()`. There is some precedent for this with property wrappers, which will also be used for attached macros.
 
 When a macro expansion is encountered in the source code, its expansion occurs in two phases. The first phase is the type-check phase, where the arguments to the macro are type-checked against the parameters of the named macro, and the result type of the named macro is checked against the context in which the macro expansion occurs. This type-checking is equivalent to that performed for a function call, and does not involve the macro definition.