Update `ColorScheme.fromSwatch` docs for Material 3 (#136816)

part of [Clarify ColorScheme fromSwatch/fromSeed usage](https://github.com/flutter/flutter/issues/132584)
https://dart.googlesource.com/external/github.com/flutter/flutter/+/5e8b5f4ea293b092e583c0fa9ad82fe189a72aa5

DEPS

diff --git a/DEPS b/DEPS
index c4f428d..c9f911f 100644
--- a/DEPS
+++ b/DEPS
@@ -269,7 +269,7 @@
 
   'engine/src/third_party/dart': Var('dart_git') + '/sdk' + '@' + '4918d3ef8c2c4ccd55e5b4110da6d89581926d2b',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'e8691444a2c7b968c977e120e185e6c3ff257fa2',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '5e8b5f4ea293b092e583c0fa9ad82fe189a72aa5',
 
   'engine/src/third_party/rapidjson':
    Var('fuchsia_git') + '/third_party/rapidjson' + '@' + 'ef3564c5c8824989393b87df25355baf35ff544b',

commits.json

diff --git a/commits.json b/commits.json
index 5d63bba..d67f093 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"a253bd75e00f525cd5041817dfe0c5959d587c96",
   "engine/src/third_party/dart":"4918d3ef8c2c4ccd55e5b4110da6d89581926d2b",
-  "flutter":"e8691444a2c7b968c977e120e185e6c3ff257fa2"
+  "flutter":"5e8b5f4ea293b092e583c0fa9ad82fe189a72aa5"
 }
\ No newline at end of file