doc: fix typos

Author: tshepang

src/libstd/sys/mod.rs

@@ -23,7 +23,7 @@
 //! integration code in `std::sys_common`. See that module's
 //! documentation for details.
 //!
-//! In the future it would be desirable for the indepedent
+//! In the future it would be desirable for the independent
 //! implementations of this module to be extracted to their own crates
 //! that `std` can link to, thus enabling their implementation
 //! out-of-tree via crate replacement. Though due to the complex

src/libstd/sys_common/mod.rs

@@ -10,7 +10,7 @@
 
 //! Platform-independent platform abstraction
 //!
-//! This is the platform-independent portion of the standard libraries
+//! This is the platform-independent portion of the standard library's
 //! platform abstraction layer, whereas `std::sys` is the
 //! platform-specific portion.
 //!