Clarify/fix typos for updater::EnumTraits comments.

This is a white space change.

Change-Id: Ic58d54926987e7e311f12868863b4520dc69ef23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449993
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813847}

chrome/updater/util.h

@@ -56,13 +56,11 @@ GURL AppendQueryParameter(const GURL& url,
 
 // Provides a way to safely convert numeric types to enumerated values.
 // To use this facility, the enum definition must be annotated with traits to
-// specify the range of the enum values. Due to how the specialization of
-// class template work in C++, the |EnumTraits| specialization must be
-// defined in the |updater| namespace. That means that traits for enum types
-// defined inside other scopes, such as nested classes or other namespaces
-// may not work if the traits type is define inside the that scope instead of
-// the |updater| namespace where the primary template is defined.
-
+// specify the range of the enum values. Due to how specialization of class
+// templates works in C++14, the |EnumTraits| specialization of the primary
+// template must be defined inside the |updater| namespace, where the
+// primary template is defined. Traits for enum types defined inside
+// other scopes, such as nested classes or other namespaces, may not work.
 //
 // enum class MyEnum {
 //   kVal1 = -1,