Update MANUAL.md (#623)

Add extra examples around CamelCase enums and and their prefix

Author: slackr

MANUAL.md

@@ -590,19 +590,29 @@ following `.proto`
 enum Foo {
     FOO_BAR = 0;
     FOO_BAZ = 1;
+}
+enum MooFoo {
+    MOO_FOO_BAR = 0;
+    MOO_FOO_BAZ = 1;
 }
  ```
 
-The prefix "FOO_" is dropped in TypeScript (unless `keep_enum_prefix` option is provided to the plugin):
+The prefix "FOO_" and "MOO_FOO" are dropped in TypeScript (unless `keep_enum_prefix` option is provided to the plugin):
 
  ```typescript
 enum Foo {
     BAR = 0,
     BAZ = 1
+}
+enum MooFoo {
+    BAR = 0,
+    BAZ = 1
 }
  ```
 
 
+
+
 A quick reminder about TypeScript enums:
 
 - It is possible to lookup the name for an enum value: