Review comments from kkolinko

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1489390 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/java/org/apache/catalina/filters/CorsFilter.java b/java/org/apache/catalina/filters/CorsFilter.java
index 2bc2220..baf1bba 100644
--- a/java/org/apache/catalina/filters/CorsFilter.java
+++ b/java/org/apache/catalina/filters/CorsFilter.java
@@ -759,7 +759,7 @@
                 }
             } catch (NumberFormatException e) {
                 throw new ServletException(
-                        sm.getString("corsFilter.invalidPreFlightMaxAge"), e);
+                        sm.getString("corsFilter.invalidPreflightMaxAge"), e);
             }
         }
 
diff --git a/java/org/apache/catalina/filters/LocalStrings.properties b/java/org/apache/catalina/filters/LocalStrings.properties
index 4991a58..66116e4 100644
--- a/java/org/apache/catalina/filters/LocalStrings.properties
+++ b/java/org/apache/catalina/filters/LocalStrings.properties
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 addDefaultCharset.unsupportedCharset=Specified character set [{0}] is not supported
-corsFilter.invalidPreFlightMaxAge=Unable to parse preflightMaxAge
+corsFilter.invalidPreflightMaxAge=Unable to parse preflightMaxAge
 corsFilter.nullRequest=HttpServletRequest object is null
 corsFilter.nullRequestType=CORSRequestType object is null
 corsFilter.onlyHttp=CORS doesn't support non-HTTP request or response
diff --git a/webapps/docs/images/cors-flowchart.png b/webapps/docs/images/cors-flowchart.png
new file mode 100644
index 0000000..9abb09d
--- /dev/null
+++ b/webapps/docs/images/cors-flowchart.png
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