Update global_&_return.rst - #95

When explaining multiple return values, it shows returning a tuple in a function, and then says you can "return separate values as well as well". However, returning "separate values" is just a different way syntactically of returning a tuple. To state that they are different would be inaccurate

In [1]: def myfunc():
   ...:     return 'a', 1
   ...: 

In [2]: type(myfunc())
Out[2]: tuple

This can be seen even outside of functions:

In [3]: a = 1,2

In [4]: type(a)
Out[4]: tuple

I'm debating whether I should keep name, age = profile() in, as it shows a good example of unpacking the results of a function, though unpacking itself isn't a specific function feature