[docs] tutorial: "The Module Search Path" section is ambiguous

[Cristian Ciupitu]

"The Module Search Path"[1] section of the tutorial starts with the
following text:

  When a module named spam is imported, the interpreter searches for a
  file named spam.py in the current directory, and then in the list of
  directories specified by the environment variable PYTHONPATH.

It mentions the "current directory" in the first paragraph, although
it's not necessarily about the current working directory just as the
second paragraph clarifies things. I think that the text should be
rephrased to make it less ambiguous. Maybe mention right from the
beginning what's really going on?

Kind regards,
Cristian

[1] http://docs.python.org/tutorial/modules.html#the-module-search-path