mod.rs: fix typo

"particularly" was misspelled.

src/libstd/prelude/mod.rs

@@ -17,7 +17,7 @@
 //!
 //! The *prelude* is the list of things that Rust automatically imports into
 //! every Rust program. It's kept as small as possible, and is focused on
-//! things, particuarly traits, which are used in almost every single Rust
+//! things, particularly traits, which are used in almost every single Rust
 //! program.
 //!
 //! On a technical level, Rust inserts