Fix broken link in Install Optional Software docs

[lbianchi-lbl]

Fixes/Addresses: #1135

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[ksbeattie]

LGTM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9d78993) 34.97% compared to head (bc12791) 34.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1138   +/-   ##
=======================================
  Coverage   34.97%   34.97%           
=======================================
  Files         161      161           
  Lines       36334    36334           
  Branches     5943     5943           
=======================================
  Hits        12708    12708           
  Misses      22616    22616           
  Partials     1010     1010           

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