rv/rvgen: fix typos in automata and generator docstring and comments

rv/rvgen: fix typos in automata and generator docstring and comments

Fix two typos in the Automata class documentation that have been
present since the initial implementation. Fix the class
docstring: "part it" instead of "parses it". Additionally, a
comment describing transition labels contained the misspelling
"lables" instead of "labels".

Fix a typo in the comment describing the insertion of the initial
state into the states list: "bein og" should be "beginning of".

Fix typo in the module docstring: "Abtract" should be "Abstract".

Fix several occurrences of "automata" where it should be the singular
form "automaton".

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/r/20260223162407.147003-8-wander@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>