Fixed bnc#795273: No documentation that describes PXE boot image deployments
Reviewed by Marcus
Fixed typo: protocoll -> protocol
Fixed bnc#795273#6, point 2
explicitly mention unsupported Aftp for SLE10
Fixed bnc#795273#7, point 1
Added alternatives to TFTP deployment (most text is taken from the KIWI documentation, slightly changed)
Rephrased sentence about SLE10 support and added Yury's suggestion
Corrected formatting to conform to HACKING convention
Merge pull request #59 from tomschr/bnc795273

Fixed bnc#795273: No documentation that describes PXE boot image deployments