[Malayalam] Spelling corrections

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Malayalam] Add examples of Dot Reph positioning using Mark glyph class

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
Merge branch 'master' of github.com:IndicFontbook/Fontbook