Very small tweak to correct the language on Homebrew's sandboxing process. Discussed in [this commit](https://github.com/bitcoin/bitcoin/commit/9fedafba4b903d7f3af044eb86dc313856e40b08).
Kills the "make" line as well.
Removes the unnecessary directions that encourage people to force install openssl into /usr/local with Homebrew. Unnecessary, and potentially quite risky. @theuni okayed this removal [here](https://github.com/bitcoin/bitcoin/pull/4740#issuecomment-53076840).