internal: make struct comment match struct name

Change-Id: I85a4051bd3413bd843b17d22cf9120f615cfe8db
Reviewed-on: https://go-review.googlesource.com/c/go/+/686295
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

src/internal/abi/type.go

@@ -483,7 +483,7 @@ type SliceType struct {
 	Elem *Type // slice element type
 }
 
-// funcType represents a function type.
+// FuncType represents a function type.
 //
 // A *Type for each in and out parameter is stored in an array that
 // directly follows the funcType (and possibly its uncommonType). So

src/internal/goroot/gc.go

@@ -37,7 +37,7 @@ func IsStandardPackage(goroot, compiler, path string) bool {
 	}
 }
 
-// gccgoSearch holds the gccgo search directories.
+// gccgoDirs holds the gccgo search directories.
 type gccgoDirs struct {
 	once sync.Once
 	dirs []string