Service Locator Markdown file changes

This includes proofreading edits to the Service Locator Markdown file.

My only question/issue was with the following sentence:

**Anytime you make something globally accessible to every part of your program, you’re asking for trouble.**

To me, "to every part of your program" seemed a bit unnecessary since "globally accessible" seems to imply that every part of your program will have access to it. However, I could be totally wrong about this. I searched Google for "globally accessible" (and many variations of the phrase) and couldn't find anything definitive regarding this issue.

I ended up changing the sentence to:

**Anytime you make something globally accessible, you're asking for trouble.**