go/packages: fix a small spelling mistake

Change-Id: I06478ae275c25c2acfc26875a175799ed2507f65
Reviewed-on: https://go-review.googlesource.com/c/tools/+/195066
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/go/packages/packages.go b/go/packages/packages.go
index 50b93c8..b29c913 100644
--- a/go/packages/packages.go
+++ b/go/packages/packages.go
@@ -1089,7 +1089,7 @@
 	return tpkg, nil
 }
 
-// impliedLoadMode returns loadMode with it's dependencies
+// impliedLoadMode returns loadMode with its dependencies.
 func impliedLoadMode(loadMode LoadMode) LoadMode {
 	if loadMode&NeedTypesInfo != 0 && loadMode&NeedImports == 0 {
 		// If NeedTypesInfo, go/packages needs to do typechecking itself so it can