Add detail to comment on range of random.random() (gh-111868)

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Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>

Doc/tutorial/stdlib.rst

@@ -153,7 +153,7 @@ The :mod:`random` module provides tools for making random selections::
    'apple'
    >>> random.sample(range(100), 10)   # sampling without replacement
    [30, 83, 16, 4, 8, 81, 41, 50, 18, 33]
-   >>> random.random()    # random float
+   >>> random.random()    # random float from the interval [0.0, 1.0)
    0.17970987693706186
    >>> random.randrange(6)    # random integer chosen from range(6)
    4