beautify doc for circ_pumps

[jkisse]

• fix too long lines in the examples

[codecov]

Codecov Report

Base: 85.14% // Head: 85.14% // No change to project coverage 👍

Coverage data is based on head (4062f9d) compared to base (eff8c7f).
Patch has no changes to coverable lines.

❗ Current head 4062f9d differs from pull request most recent head 6e009ba. Consider uploading reports for the commit 6e009ba to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #470   +/-   ##
========================================
  Coverage    85.14%   85.14%           
========================================
  Files           90       90           
  Lines         6071     6071           
========================================
  Hits          5169     5169           
  Misses         902      902           

Impacted Files	Coverage Δ
pandapipes/create.py	91.92% <ø> (ø)

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