Typo In DataStructures/Graphs/BellmanFord.java

[nishantc1527]

Is your feature request related to a problem? Please describe.
Line 7 of Bellman Ford contains a typo where the word vertes should be vertex.

Describe the solution you'd like
Change the word vertes to vertex.

Describe alternatives you've considered

Additional context

[yanglbme]

#2190