Correct path for the warmup call

[oittaa]

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[oittaa]

@googlebot I signed it!

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[busunkim96]

For other reviewers: this is the warmup route in main.py

python-docs-samples/appengine/standard_python37/warmup/main.py

Lines 27 to 30 in 00e7377

	@app.route('/_ah/warmup')
	def warmup():
	# Handle your warmup logic here, e.g. set up a database connection pool
	return '', 200, {}

[tmatsuo]

@oittaa Thanks for the contribution!