tools/gn: Fix more "propogated" typos.

tools/gn/target.cc

Index: tools/gn/target.cc
diff --git a/tools/gn/target.cc b/tools/gn/target.cc
index 93dbbe2ae851da83f6c4fa72ccf6f18ed3884bba..585c850c3e5e794c67c19931ab50ea7346ce6ddd 100644
--- a/tools/gn/target.cc
+++ b/tools/gn/target.cc
@@ -277,7 +277,7 @@ void Target::PullDependentTarget(const Target* dep, bool is_public) {
     //
     // However, if the dependency is private:
     //   EXE -> INTERMEDIATE_SHLIB --[private]--> FINAL_SHLIB
-    // the dependency will not be propogated because INTERMEDIATE_SHLIB is
+    // the dependency will not be propagated because INTERMEDIATE_SHLIB is
     // not granting permission to call functiosn from FINAL_SHLIB. If EXE
     // wants to use functions (and link to) FINAL_SHLIB, it will need to do
     // so explicitly.