[short_path] Editorial Suggestions

[HumphreyYang]

Comments by @SylviaZhaooo.

• Delete one of the etc. and make the dot points the complete sentence (remove the capitalization).
• Improve all the graphs in the lecture -- the number is not clear in the path (@mmcky) [short_path_graph] Update all graphs #480
• "preceding example" -> "preceding example."
• Bold Bellman Equation and get a Wikipedia link to Bellman
• np.inf to np.inf
• Change the shortest path code to the cleaner version @SylviaZhaooo and also in the exercise.
• change np.array_equal to np.allclose

[mmcky]

@SylviaZhaooo can you confirm if this has been done in your update PR?

• change it to np.allclose()

[HumphreyYang]

Many thanks @mmcky and @SylviaZhaooo. The item should be

• change np.array_equal to np.allclose

I should have updated this after the meeting : )

[SylviaZhaooo]

@SylviaZhaooo can you confirm if this has been done in your update PR?

• change it to np.allclose()

Sorry for the late reply, I think this has been done.