Fix two grammatical errors

Signed-off-by: Thomas Ackermann <th.acker@arcor.de>
Expand undefined alias

"lga" is not defined anywhere in the text; all other examples use explicit "git log ..."

Signed-off-by: Thomas Ackermann <th.acker@arcor.de>
Merge pull request #171 from tacker66/some_more_fixes

Some more fixes