Remove duplicate paragraph (rust-lang#1523)

Author: anirudh24seven

src/diagnostics/lintstore.md

@@ -14,11 +14,6 @@ There are two parts to the linting mechanism within the compiler: lints and
 lint passes. Unfortunately, a lot of the documentation we have refers to both
 of these as just "lints."
 
-First, we have the lint declarations themselves: this is where the name and
-default lint level and other metadata come from. These are normally defined by
-way of the [`declare_lint!`] macro, which boils down to a static with type
-[`&rustc_lint_defs::Lint`].
-
 First, we have the lint declarations themselves,
 and this is where the name and default lint level and other metadata come from.
 These are normally defined by way of the [`declare_lint!`] macro,