• Change a section id to something closer to the real content of the section (s/install-floppies/install-boot-media) to ease the read of the file;
• Some rewordings for i386 boot part to mention USB stick media. I let floppies part since it's still correct for 7.X;
• Updates of some boot messages (still a work in progress);
• Add a screenshot for the keyboard selection at sysinstall(8) start which occurs if United States is not selected for the country.

PR: docs/145023
Submitted by: Aiza <aiza21@comclark.com>