Fix Graph.modify/3 examples

[tylerhunt]

Description

Update the documentation for Graph.modify/3 to fix the examples, which had:

|> Graph.modify( :explicit_id, &text("Updated Text 1") )

While it looks that should be:

|> Graph.modify( :explicit_id, &text(&1, "Updated Text 1") )

Motivation and Context

The example code doesn't work.

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist

• [x] Check other PRs and make sure that the changes are not done yet.
• [x] The PR title is no longer than 64 characters.

[codecov[bot]]

Codecov Report

Merging #212 (3108143) into master (9642150) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   86.66%   86.66%           
=======================================
  Files          87       87           
  Lines        2340     2340           
=======================================
  Hits         2028     2028           
  Misses        312      312           

Impacted Files	Coverage Δ
lib/scenic/graph.ex	95.04% <ø> (ø)

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[boydm]

Thank you!