added text on render example

[shimwell]

closes #265

[codecov]

Codecov Report

Merging #266 (ad38a0b) into develop (7765239) will increase coverage by 1.13%.
The diff coverage is n/a.

❗ Current head ad38a0b differs from pull request most recent head ee0c09c. Consider uploading reports for the commit ee0c09c to get more accurate results

@@             Coverage Diff             @@
##           develop     #266      +/-   ##
===========================================
+ Coverage    95.20%   96.33%   +1.13%     
===========================================
  Files           82       81       -1     
  Lines         5523     5432      -91     
===========================================
- Hits          5258     5233      -25     
+ Misses         265      199      -66     

Impacted Files	Coverage Δ
paramak/__init__.py
paramak/shape.py	97.06% <0.00%> (+1.37%)	⬆️
paramak/reactor.py	79.91% <0.00%> (+5.22%)	⬆️
paramak/utils.py	92.72% <0.00%> (+10.78%)	⬆️

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