Fix minor typo in CONTRIBUTORS.md

[bobleesj]

Remove extra trailing spaces and typo caught by pre-commit.

y4DSTEM/process/phase/ptychographic_tomography.py:121: perfomed ==> performed
py4DSTEM/process/phase/ptychographic_tomography.py:307: perfomed ==> performed
py4DSTEM/process/phase/ptychographic_tomography.py:841: vaccum ==> vacuum
py4DSTEM/process/phase/ptychographic_tomography.py:913: perfomed ==> performed
py4DSTEM/process/strain/strain.py:413: posistions ==> positions
py4DSTEM/process/strain/strain.py:433: calcuate ==> calculate
py4DSTEM/process/strain/strain.py:877: specificied ==> specified
py4DSTEM/process/strain/strain.py:887: dispay ==> display
py4DSTEM/process/utils/elliptical_coords.py:14: represenation ==> representation
CONTRIBUTORS.md:23: commited ==> committed
py4DSTEM/braggvectors/diskdetection_aiml.py:98: recommeded ==> recommended
py4DSTEM/braggvectors/diskdetection_aiml.py:385: funciton ==> function
py4DSTEM/braggvectors/diskdetection_aiml.py:583: funciton ==> function
py4DSTEM/braggvectors/probe.py:239: supresses ==> suppresses
...

[bobleesj]

A bit more remaining but for my first PR, just wanted to keep this PR simple.

[sezelt]

Partially fixes #692

[bsavitzky]

Thanks @bobleesj !