Grid corrections in intake file for ECCO and LLC4320

[asiddi24]

Addressed #255 and updated the grid coords defined for ECCOv4r4 and LLC4320. Now the grid looks correct.

od.grid

<xgcm.Grid>
Z Axis (not periodic, boundary=None):
  * center   Z --> left
  * left     Zl --> center
  * outer    Zp1 --> center
  * right    Zu --> center
X Axis (not periodic, boundary=None):
  * center   X --> right
  * right    Xp1 --> center
time Axis (not periodic, boundary=None):
  * center   time_midp --> outer
  * outer    time --> center
Y Axis (not periodic, boundary=None):
  * center   Y --> right
  * right    Yp1 --> center

[codecov]

Codecov Report

Merging #261 (ed2f754) into main (1e2f203) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #261   +/-   ##
=======================================
  Coverage   95.54%   95.54%           
=======================================
  Files          10       10           
  Lines        3634     3634           
  Branches      773      773           
=======================================
  Hits         3472     3472           
  Misses        110      110           
  Partials       52       52           

Flag	Coverage Δ
unittests	95.54% <ø> (ø)

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[ThomasHaine]

Looks good!