Update advanced_foreword.rst

I think the doc is supposed to read, "Because of that, Flask has a few design choices that some people might find surprising or unorthodox."

Otherwise, it could possibly mean, "Because of that, Flask has few design choices that people would find surprising or unorthodox."

Or perhaps even less ambiguous, "Because of that, Flask has few surprising or unorthodox design choices."

docs/advanced_foreword.rst

@@ -8,7 +8,7 @@ Thread-Locals in Flask
 
 One of the design decisions in Flask was that simple tasks should be simple;
 they should not take a lot of code and yet they should not limit you. Because
-of that, Flask has few design choices that some people might find surprising or
+of that, Flask has a few design choices that some people might find surprising or
 unorthodox. For example, Flask uses thread-local objects internally so that you
 don’t have to pass objects around from function to function within a request in
 order to stay threadsafe. This approach is convenient, but requires a valid