Add a reference to abseil's totw from the C++ dos and don'ts

Change-Id: Ibf446049a08424afcc43851ec8ba8fefc54e65a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4528459
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1143689}

styleguide/c++/c++-dos-and-donts.md

@@ -68,8 +68,9 @@ class TypeName {
 
 ## Variable initialization
 
-There are myriad ways to initialize variables in C++11.  Prefer the following
+There are myriad ways to initialize variables in C++. Prefer the following
 general rules:
+
 1. Use assignment syntax when performing "simple" initialization with one or
    more literal values which will simply be composed into the object:
 
@@ -126,6 +127,9 @@ general rules:
    auto x{1};  // Until C++17, decltype(x) is std::initializer_list<int>, not int!
    ```
 
+For more reading, please see abseil's [Tip of the Week #88: Initialization: =,
+(), and {}](https://abseil.io/tips/88).
+
 ## Initialize members in the declaration where possible
 
 If possible, initialize class members in their declarations, except where a