Svn info and BFG

Created a couple of tips

1. Use the BFG for certain re-write of history
2. Suggest how git-svn info is useful in legacy build scripts
3. Fix a typo
"what *it* can do"

Also, the sentence isn't grammatically correct. Either remove the "this can make a big difference" or make a new sentence. IMHO, this is not needed.