docs: add examples

[RebeccaStevens]

PR Checklist

• Addresses an existing open issue: fix 🧪 Tooling: Ensure that all exported functions have a code example #52
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds a bunch of examples.

[codecov]

Codecov Report

Merging #127 (8323412) into main (a3359fd) will decrease coverage by 0.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   21.80%   21.34%   -0.47%     
==========================================
  Files          18       18              
  Lines         431      431              
  Branches      171      171              
==========================================
- Hits           94       92       -2     
- Misses        315      316       +1     
- Partials       22       23       +1     

Flag	Coverage Δ
4.2.4	?
4.3.5	21.34% <ø> (ø)
4.4.4	21.34% <ø> (ø)
latest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/comments.ts	0.00% <ø> (ø)
src/compilerOptions.ts	84.21% <ø> (ø)
src/flags.ts	100.00% <ø> (ø)
src/modifiers.ts	0.00% <ø> (ø)
src/nodes/typeGuards/compound.ts	40.90% <ø> (ø)
src/nodes/typeGuards/single.ts	0.00% <ø> (ø)
src/nodes/typeGuards/union.ts	1.94% <ø> (ø)
src/scopes.ts	0.00% <ø> (ø)
src/syntax.ts	91.66% <ø> (ø)
src/tokens.ts	0.00% <ø> (ø)
... and 6 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[JoshuaKGoldberg]

Love it!!