Changed Source Meter Unit to Source Measure Unit

[mgallatinNI]

• This contribution adheres to CONTRIBUTING.md.

- [ ] I've updated CHANGELOG.md if applicable.

- [ ] I've added tests applicable for this pull request

What does this Pull Request accomplish?

Change Source Meter Unit to Source Measure Unit which is what the acronym SMU actually means.

List issues fixed by this Pull Request below, if any.

None

What testing has been done?

None, its just a a documentation change.

[ni-jfitzger]

Huh. I thought it was Source Measurement Unit. You learn something every day.
Nice catch.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.13%. Comparing base (9f7b5b8) to head (22da6c5).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2215   +/-   ##
=======================================
  Coverage   88.13%   88.13%           
=======================================
  Files          88       88           
  Lines       22828    22828           
=======================================
+ Hits        20119    20120    +1     
+ Misses       2709     2708    -1     

Flag	Coverage Δ
codegenunittests	84.98% <ø> (ø)
nidcpowersystemtests	94.40% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.04% <ø> (ø)
nidigitalunittests	68.43% <ø> (ø)
nidmmsystemtests	92.33% <ø> (ø)
nifakeunittests	86.08% <ø> (ø)
nifgensystemtests	94.34% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsasystemtests	82.71% <ø> (ø)
nirfsaunittests	63.40% <ø> (ø)
nirfsgsystemtests	81.18% <ø> (ø)
niscopesystemtests	89.99% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	81.66% <ø> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

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