fix typo in comment

Dante-Broggi · web-flow · commit 6890810e6833 · 2018-07-28T14:32:42.000-04:00
diff --git a/include/swift/ABI/Metadata.h b/include/swift/ABI/Metadata.h
@@ -2255,7 +2255,7 @@ class RelativeTargetProtocolDescriptorPointer {
   }
 };
 
-/// A referenc to a type.
+/// A reference to a type.
 template <typename Runtime>
 struct TargetTypeReference {
   union {

Original file line number	Diff line number	Diff line change
`@@ -2255,7 +2255,7 @@ class RelativeTargetProtocolDescriptorPointer {`
`2255`	`2255`	`}`
`2256`	`2256`	`};`
`2257`	`2257`
`2258`		`-/// A referenc to a type.`
	`2258`	`+/// A reference to a type.`
`2259`	`2259`	`template <typename Runtime>`
`2260`	`2260`	`struct TargetTypeReference {`
`2261`	`2261`	`union {`