[ReadTheDocs] Updating the documentation URLs from stable to last released

[rahur-NI]

• 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?

This PR is to update all the ReadTheDocs documentation URLs in documentation template to not point to /stable
version for consistency across all drivers.
Before this fix, nidcpower and nirfsg had only /latest version (these were setup for independent versioning where ReadTheDocs redirects to last released version). But all other modules had /stable and /latest in which stable versioning will become outdated with the next release. This was causing inconsistency across the driver's documentation and the nirfsg link was bad.

After this fix, all the modules will be pointing to the last released version as default.

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

None.

What testing has been done?

A successful tox execution with expected file change in README.rst

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.86%. Comparing base (f77dd57) to head (b9ca957).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2173      +/-   ##
==========================================
- Coverage   91.18%   89.86%   -1.32%     
==========================================
  Files          67       73       +6     
  Lines       16489    19004    +2515     
==========================================
+ Hits        15035    17078    +2043     
- Misses       1454     1926     +472     

Flag	Coverage Δ
codegenunittests	84.90% <ø> (ø)
nidcpowersystemtests	94.65% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.26% <ø> (ø)
nidigitalunittests	68.44% <ø> (ø)
nidmmsystemtests	92.72% <ø> (ø)
nifakeunittests	86.01% <ø> (ø)
nifgensystemtests	94.61% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsgsystemtests	81.19% <ø> (?)
niscopesystemtests	92.94% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	82.03% <ø> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

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see 7 files with indirect coverage changes

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[ni-jfitzger]

Fixed some issues with the description. The PR will change what we're pointing to, but it won't delete or hide the stable version. Until our next release of APIs besides nidcpower and nirfsg, those other APIs will still redirect to stable. I'll have to make some changes in ReadTheDocs when I release them to hide the stable version and maybe to redirect (not sure). Right now those other APIs will redirect to stable, but that's okay because stable is still the last released version for them.