Update scheduler.py

Typofix.
Update gpi_vhpi.c

Typofix.
Update test_endian_swapper_hal.py

Typofix
Update introduction.rst

Fix link.
Update introduction.rst

Typofix.
Update quickstart.rst

Typofixes.
Update coroutines.rst

Typofix.
Update endian_swapper.rst

Typofixes.
Update ping_tun_tap.rst

Typofix.
Update hal_cosimulation.rst

Typofix.
Update decorators.py

Typofix in docstring.
Update scoreboard.py

Typofixes in docstrings.
Update building.rst

Typofixes. Add VHDL_SOURCES doc.
Merge pull request #155 from cmarqu/master

Various typofixes