doc: remove openssl 1.x reference
OpenSSL 1.x is only used in v16 and v14. To avoid confusions I recommend removing OpenSSL 1.x references from main and v18.x.
Note: these references will still exist in v16.x and v14.x branches
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OpenSSL 1.x is only used in v16 and v14. To avoid confusions I recommend removing OpenSSL 1.x references from main and v18.x.
Note: these references will still exist in v16.x and v14.x branches