Consider the fact that there are really three (or more) code blocks in play here:
try {}
catch (myexcption)
{}
catch (myotherexception)
{}
finally
{}
Keep in mind that these are in the scope of a larger context and the exceptions not caught are potentually caught further up the stack.
Note that this is basically the same thing as a class construct that also has the {} structure.
Say for instance you might have:
try
try
if (iAmnotsane)
beatMe(please);
catch (Exception myexception)
catch (myotherexception)
logerror("howdy")
finally
NOW does that second catch belong to the first or the second try? What about the finally? SO you see the optional/multiple portions make the requirement.