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bpo-31454: Include information about "import X as Y" in Modules tutorial (pythonGH-4041)

(cherry picked from commitfbee882)Co-authored-by: Mario Corchero <mariocj89@gmail.com>

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Original file line number	Diff line number	Diff line change
@@ -108,6 +108,25 @@ Note that in general the practice of importing ``*`` from a module or package is
`108`	`108`	`frowned upon, since it often causes poorly readable code. However, it is okay to`
`109`	`109`	`use it to save typing in interactive sessions.`
`110`	`110`
	`111`	+If the module name is followed by:keyword:`as`, then the name
	`112`	+following:keyword:`as` is bound directly to the imported module.
	`113`	`+`
	`114`	`+::`
	`115`	`+`
	`116`	`+ >>> import fibo as fib`
	`117`	`+ >>> fib.fib(500)`
	`118`	`+ 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377`
	`119`	`+`
	`120`	+This is effectively importing the module in the same way that ``import fibo``
	`121`	+will do, with the only difference of it being available as ``fib``.
	`122`	`+`
	`123`	+It can also be used when utilising:keyword:`from` with similar effects::
	`124`	`+`
	`125`	`+ >>> from fibo import fib as fibonacci`
	`126`	`+ >>> fibonacci(500)`
	`127`	`+ 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377`
	`128`	`+`
	`129`	`+`
`111`	`130`	`..note::`
`112`	`131`
`113`	`132`	`For efficiency reasons, each module is only imported once per interpreter`

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