Update text/0000-packages-as-optional-namespaces.md

Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>

Author: Manishearth

text/0000-packages-as-optional-namespaces.md

@@ -7,7 +7,7 @@
 
 Languages like C++ have open namespaces where anyone can write code in any namespace.  In C++'s case, this includes the `std` namespace and is only limited by convention.  In contrast, Rust has closed namespaces which can only include code from the original namespace definition (the crate).
 
-This proposal extends Rust to have partially open namespaces by allowing crate owners to create crates like `parent::foo` that will be available as part of the crate `parent`'s namespace.  To protect the use of open namepsaces, the owners of `parent` has exclusive access to publishing crates in that namespace.
+This proposal extends Rust to have partially open namespaces by allowing crate owners to create crates like `parent::foo` that will be available as part of the crate `parent`'s namespace.  To protect the use of open namespaces, the owners of `parent` has exclusive access to publishing crates in that namespace.
 
 # Motivation