Document Entry's glob pattern

defineConfig's entry parameter takes an Entry, and it's not clear what to write there when you want a pattern of files to be matched.
For instance, I wanted the entire base/ directory's ts files to be matched, including in subdirectories. I tried the "base/*.ts" pattern, which is the pattern used in package.json's "exports" key where a single star may match the slash of a subdirectory : it didn't work and took only the direct members of the base/ directory.
I also tried the "base/**.ts" pattern, which in some cases is supposed to match subdirectories, and more surprisingly, I got the same result.
I had to dive in the code and in tinyglobby's documentation to arrive at the guess that "base/**/*.ts" was what I was looking for, and there it actually was : it worked.

There should be a mention in the documentation that patterns are accepted by the Entries, and what syntax these patterns accept.

Start by reading the documentation for defineConfig's Entry parameter and tinyglobby's pattern syntax, comparing them with package.json's exports behavior. Document that Entry accepts glob patterns and explain that base/**/*.ts matches TypeScript files in base/ and subdirectories; done when users can choose the correct recursive pattern without inspecting the code.