Fixed bugs in "catch" and "fdoc" snippets.

UltiSnips/d.snippets

@@ -335,7 +335,7 @@ finally
 endsnippet
 
 snippet catch "catch (catch)" b
-catch(${1}:Exception)
+catch(${1}Exception)
 {
     ${2:/*handle exception*/}
 }
@@ -498,7 +498,7 @@ snippet fdoc "function ddoc block (fdoc)" b
 ///
 /// ${6:Returns: ${7:return value}}
 ///
-/// ${8:Throws:  ${8}Exception ${9}}
+/// ${8:Throws:  ${9}Exception ${10}}
 endsnippet
 
 snippet Par "Params (Par)"