Indentation and import fix

[wvdtoorn]

Fixes #2537

Changes made in this Pull Request:

• sphinx indentation fix
• Import failure fix

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[IAlibay]

@wvandertoorn since we aren't getting a Travis check on PRs to PRs, could you confirm that building the docs completed successfully for you?

[wvdtoorn]

@IAlibay yes, building the docs completed successfully for me

[codecov]

Codecov Report

Merging #2629 into densityanalysis-2502 will increase coverage by 1.06%.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##           densityanalysis-2502    #2629      +/-   ##
========================================================
+ Coverage                 90.78%   91.85%   +1.06%     
========================================================
  Files                       174       15     -159     
  Lines                     23600     2013   -21587     
  Branches                   3075        0    -3075     
========================================================
- Hits                      21426     1849   -19577     
+ Misses                     1549      164    -1385     
+ Partials                    625        0     -625     

Impacted Files	Coverage Δ
package/MDAnalysis/lib/c_distances.pyx
...kage/MDAnalysis/analysis/hydrogenbonds/__init__.py
package/MDAnalysis/transformations/fit.py
...alysis/encore/dimensionality_reduction/__init__.py
package/MDAnalysis/lib/formats/cython_util.pyx
package/MDAnalysis/coordinates/DLPoly.py
package/MDAnalysis/visualization/streamlines_3D.py
package/MDAnalysis/coordinates/GRO.py
package/MDAnalysis/coordinates/PDBQT.py
...ckage/MDAnalysis/analysis/encore/confdistmatrix.py
... and 148 more

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