[Term Entry] SwiftUI ViewModifier: `.bold()`

[yangc95]

Reason/inspiration (optional)

Please write a new entry under:
content/swiftui/concepts/viewmodifier/terms/ about the modifier .bold() in Swift.

• A "Syntax" section with pseudo code snippet.
• An "Example" section with a swift code snippet and image to accompany. Images should go in the media/ folder.

To get started with the PR and entry file:

Under content/swiftui/concepts/viewmodifier/terms/, create a new folder called bold. Then create a new file called bold.md under content/swiftui/concepts/viewmodifier/terms/bold

Entry Type (select all that apply)

New Term for Existing Concept Entry

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[gracekishino]

Please can I work on this issue?

[Dusch4593]

@gracekishino You're assigned! 😄