Update static initializers doc to not suggest LazyInstance.

base::LazyInstance is deprecated.

Change-Id: Ic8b37b335004ae0c5cd3cad1c82cb06f25551499
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438575Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811856}

docs/static_initializers.md

@@ -17,9 +17,9 @@ http://neugierig.org/software/chromium/notes/2011/08/static-initializers.html
 
 Common fixes include:
 
-* Add constexpr,
-* Use LazyInstance<>,
-* Move global variable to be a static variable within a function that returns it.
+* Add constexpr.
+* Move global variable to be a static variable within a function that returns
+  it, often wrapped in `base::NoDestructor`.
 
 ## Listing Static Initializers