Fix scramble algorithm docs

[kelunik]

Also fixes two typos in error messages.

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
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[mysql-oca-bot]

Hi, there was no response to our request to sign an OCA or confirm the code is submitted under the terms of the OCA. As such this request will be closed.
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[kelunik]

@mysql-oca-bot I sent a mail, but haven't received a response. I can't fill the form, because there are obligatory fields I can't provide a value for.

[mysql-admin]

@kelunik,
Sorry to hear you had an issue with the OCA form
Please email me directly with the details (omer.barnir@oracle.com)

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==Omer
P.S Reopening the PR to allow more time for this to be resolved

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
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[kelunik]

@mysql-admin Thanks! I just sent the mail.

[mysql-oca-bot]

Hi, there was no response to our request to sign an OCA or confirm the code is submitted under the terms of the OCA. As such this request will be closed.
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[kelunik]

@mysql-admin Please re-open, as the OCA is finally done and approved now.

[mysql-admin]

Sorry this dropped off the radar - reopening
==Omer

[mysql-oca-bot]

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[kelunik]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

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