Fix typos & broken links

[exelotl]

Here's some of the typos I've spotted in my time reading tonc:

• first.htm
  • that doesn't support what 3/1 ROM waitstates
• hardware.htm
  • Nintendo GameBoy Advance
  • This not a full list
  • [Add pic of GB Micro]
  • GameBoy
  • LUA
  • [update http://nocash.emubase.de/gbatek.htm to a valid URL]
  • the GBATek
• bitmaps.htm
  • [bad link in toc]
• sound.htm
  • REG_SND1FREQ [in table, should be 2]
  • Indicates which DMA channels [should be DMG]
• asm.htm
  • less than 1 MB or work RAM
  • Remember that ROM and EWEAM
• mode7.htm
  • // Mixed fixed point: lam, lxr, lyr use .12 --> this is a lie, it's actually lam, lcf, lsf are .12, lxr, lyr are .8

[avivace]

Looks like most of these could be fixed now that they were ported to markdown.. want to take a look at it @exelotl ?

[exelotl]

Absolutely, I'll take a look after I've gotten the setup chapter out the way (which I haven't forgotten about, just been very occupied with game launch stuff this week!)