fix trivial typos in documents; NFC

llvm-svn: 306975
diff --git a/llvm/docs/Coroutines.rst b/llvm/docs/Coroutines.rst
index f7a3857..1bea04e 100644
--- a/llvm/docs/Coroutines.rst
+++ b/llvm/docs/Coroutines.rst
@@ -846,7 +846,7 @@
 """""""""
 
 The '``llvm.coro.alloc``' intrinsic returns `true` if dynamic allocation is
-required to obtain a memory for the corutine frame and `false` otherwise.
+required to obtain a memory for the coroutine frame and `false` otherwise.
 
 Arguments:
 """"""""""