Issues with the Configurable Options section of the readme

[mweimer77]

I am testing the app config options and came across some observations. I'm not sure if these need addressed or not but I'd thought I'd add them anyway.

1. "Specify up to five browsers" not in this section, maybe it should be. I know it's found elsewhere
2. Inconsistent useage of the word "value=". It's used in some bullet points and not in others. We need to make it consistent
3. The bullet point "Automatically check spelling on each page" has no key or value associated with it