Fix link to hygienic macros on Wikipedia

[midinastasurazz]

The link address is defined below the paragraph so no need to have it inline.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @pcwalton (or someone else) soon.

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[steveklabnik]

@bors: r+ rollup

[bors]

📌 Commit 3e8038b has been approved by steveklabnik

[steveklabnik]

Thank you!

[alexispurslane]

This is strange! I thought I had made a pull request that did this, too. And it got merged. Thats weird.

[midinastasurazz]

@steveklabnik You are welcome!
@ChristopherDumas Your pull request got merged. However, the link did not work since markdown requires the inline link address to be in "()" instead of "[]". Basically there was a typo. Furthermore, there is no need for an inline address because the link in question is defined just below the paragraph.

[alexispurslane]

Oops! OK.

[steveklabnik]

I thought I had remembered something, but I couldn't place it.