Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine examples/memory/password_recovery.py, examples/rnn/reber_gru.py, neupy/core/docs.py, site/2015/09/21/password_recovery.rst, tests/algorithms/test_signals.py and observe beggining, however expect to see beginning.
• Examine neupy/utils/tf_utils.py and observe varible, however expect to see variable.
• Examine site/2015/09/21/password_recovery.rst and observe sumbmission, however expect to see submission.
• Examine tests/algorithms/competitive/test_lvq.py and observe sublcasses, however expect to see subclasses.
• Examine site/conf.py and observe settigs, however expect to see settings.
• Examine tests/algorithms/rbm/test_rbm.py and observe possilbe, however expect to see possible.
• Examine examples/reinforcement_learning/rl_cartpole.py and observe penalyze, however expect to see penalize.
• Examine site/2015/09/20/discrete_hopfield_network.rst and observe continous, however expect to see continuous.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR. Alternatively if the fix is undesired please
close the issue with a small comment about the reasoning.

https://github.com/timgates42/neupy/pull/new/bugfix_typos

Thanks.