Completed the Spanish translation for the Advanced Networking chapter. This work brings the chapter to 100% synchronization with the latest English version. All previously pending strings have been translated and reviewed to ensure full coverage.

Build was verified on FreeBSD 15.0-RELEASE-p4 using the docproj toolset. The command "make DOC_LANG=es" was executed in the documentation directory; the advanced-networking chapter was built successfully and correctly rendered in AsciiDoc without formatting errors.