[doc] dlopen docstring (#31475)
Documentation for `dlopen_e`: looks like copy-paste error from https://github.com/JuliaLang/julia/commit/d9d2b9cf808aab8c3a90e95e03ffc32761ce5316#diff-4f669dd4cc416a82508956a377e6a7c9
Correct:
`dlopen_e` deprecated in favor of `dlopen(...throw_error=false)`;
`dlsym_e` deprecated in favor of `dlsym(...throw_error=false)`;
Current documentation lists `dlopen_e` deprecated in favor of `dlsym`.
