[WIP][MINOR][TYPO] Fix several trivival typos

## What changes were proposed in this pull request?

* Fixed one typo `"overriden"` as `"overridden"`, also make sure no other same typo.
* Fixed one typo `"lowcase"` as `"lowercase"`, also make sure no other same typo.

## How was this patch tested?

Since the change is very tiny, so I just make sure compilation is successful.
I am new to the spark community,  please feel free to let me do other necessary steps.

Thanks in advance!

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Updated: Found another typo `lowcase` later and fixed then in the same patch

Author: Zhenglai Zhang <zhenglaizhang@hotmail.com>

Closes #14622 from zhenglaizhang/fixtypo.