ENH: Make method scope choosable.

In Java, the method snippet now lets one choose the scope:
- public
- private
- protected
- ""

Also fixed a typo.
* snippets/java-mode/method: Method scope is choosable now.

snippets/java-mode/method

@@ -2,6 +2,6 @@
 # name: method
 # key: m
 # --
-${1:public} ${2:void} ${3:name}(${4:args}) {
+${1:$$(yas-choose-value '("public" "private" "protected" ""))} ${2:void} ${3:name}(${4:args}) {
             $0
 }

snippets/java-mode/param

@@ -2,4 +2,4 @@
 # name: param
 # key: param
 # --
-@param ${1:paramater} $0
+@param ${1:parameter} $0