Fix the example for folly::static_function_deleter.
Fix the example for folly::static_function_deleter.

Summary: [Folly] Fix the example for folly::static_function_deleter.

The problem is that

    int BIO_free(BIO*)

is not directly compatible.

So have two examples. One using `RSA_free` which is compatible, and one making a compatible wrapper around `BIO_free`.

Reviewed By: @Gownta

Differential Revision: D2381125

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