tests: Invert comments on pattern trailer handling, extend test values

[huntie]

Hey, I've been looking through the tests for this library and spotted something which I'd interpreted differently in the spec. Specifically, the behaviour of pattern trailers for subpath exports, described in more detail here: nodejs/node#39635.

Changes:

• Change the two relevant comments in tests
• Extend test values for subpath exports to include an intermediate subdirectory

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (e0a914b) compared to base (587b0ba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           51        52    +1     
=========================================
+ Hits            51        52    +1     

Impacted Files	Coverage Δ
src/index.js	100.00% <0.00%> (ø)

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