Add Wikipedia links for dissertation and PhD history context

[Copilot]

Links dissertation and PhD terminology to their Wikipedia articles in the "Historical Context: The Masterpiece Tradition" section.

Changes:

• Link "dissertation" to https://en.wikipedia.org/wiki/Thesis
• Link "PhD" to https://en.wikipedia.org/wiki/Doctor_of_Philosophy#History
• Add "(or thesis)" terminology clarification

Before:

The dissertation is a spiritual successor to an apprentice's masterpiece in craft guilds.

After:

The [dissertation](https://en.wikipedia.org/wiki/Thesis) (or thesis),
a requirement for earning a [PhD](https://en.wikipedia.org/wiki/Doctor_of_Philosophy#History),
is a spiritual successor to an apprentice's [masterpiece](https://en.wikipedia.org/wiki/Masterpiece#History) in craft guilds.

Original prompt

link to https://en.wikipedia.org/wiki/Thesis and https://en.wikipedia.org/wiki/Doctor_of_Philosophy#History in discussion of dissertation history and scope

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