manual generation: change capitalization of messages

manual generation: change capitalization of messages

When generating the manual, you see following messages:

>>>   Generating HTML manual...
>>>   Generating Split HTML manual...
>>>   Generating PDF manual...
>>>   Generating Text manual...
>>>   Generating EPUB manual...

and with this patch the capitalization is changed so that it becomes:

>>>   Generating HTML manual...
>>>   Generating split HTML manual...
>>>   Generating PDF manual...
>>>   Generating text manual...
>>>   Generating ePUB manual...

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>