adding algorithm explanation for partition_in_place iter method and bounding complexity to current implementation
adding algorithm explanation for partition_in_place iter method and bounding complexity to current implementation

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust