Remove unnecessary capitalisation

'context' does not need need a capital letter in the middle of a
sentence.

Author: tcharding

src/context.rs

@@ -60,8 +60,8 @@ pub mod global {
 }
 
 
-/// A trait for all kinds of Context's that lets you define the exact flags and a function to deallocate memory.
-/// It shouldn't be possible to implement this for types outside this crate.
+/// A trait for all kinds of contexts that lets you define the exact flags and a function to
+/// deallocate memory. It shouldn't be possible to implement this for types outside this crate.
 pub unsafe trait Context : private::Sealed {
     /// Flags for the ffi.
     const FLAGS: c_uint;