update_engine: fixed remaining linter and some spelling errors

Fixed remaining errors from cpplint as well as some spelling errors
mostly in comments.

BUG=None
TEST=FEATURES=test emerge-link update_engine

Change-Id: I484988ab846ac5a3c68c016ddccfb247f225ec27
Reviewed-on: https://chromium-review.googlesource.com/208897
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/payload_generator/graph_utils.cc b/payload_generator/graph_utils.cc
index b3c4231..dd5d9df 100644
--- a/payload_generator/graph_utils.cc
+++ b/payload_generator/graph_utils.cc
@@ -139,7 +139,7 @@
   LOG(INFO) << "Graph length: " << graph.size();
   for (Graph::size_type i = 0, e = graph.size(); i != e; ++i) {
     string type_str = "UNK";
-    switch(graph[i].op.type()) {
+    switch (graph[i].op.type()) {
       case DeltaArchiveManifest_InstallOperation_Type_BSDIFF:
         type_str = "BSDIFF";
         break;