[WebAssembly] Fix typos

Patch by Nicholas Wilson

Differential Revision: https://reviews.llvm.org/D40691

llvm-svn: 319506
diff --git a/lld/wasm/Driver.cpp b/lld/wasm/Driver.cpp
index 769ef85..6cfb49e 100644
--- a/lld/wasm/Driver.cpp
+++ b/lld/wasm/Driver.cpp
@@ -136,7 +136,7 @@
 
 // Inject a new wasm global into the output binary with the given value.
 // Wasm global are used in relocatable object files to model symbol imports
-// and exports.  In the final exectuable the only use of wasm globals is the
+// and exports.  In the final executable the only use of wasm globals is
 // for the exlicit stack pointer (__stack_pointer).
 static void addSyntheticGlobal(StringRef Name, int32_t Value) {
   log("injecting global: " + Name);