How-to-guide to cover LRScheduler

[divyanshugit]

Following up on this question: pytorch/ignite#2441. As mentioned in the comments, It would be great to have an example for using LRScheduler in How-to-guide. The code example is already available in the comments

[sadra-barikbin]

@vfdev-5 , shall I work on this issue? shall I continue #79 or #49 ?

[vfdev-5]

@sadra-barikbin Yes, sure

[sadra-barikbin]

@vfdev-5, please assign it to me.