Auto merge of #36310 - jstnlef:remove-extraneous-not-equal-impl, r=sfackler
Auto merge of #36310 - jstnlef:remove-extraneous-not-equal-impl, r=sfackler

Removing the extraneous not_equal implementation for slices

Happened to stumble upon this one awhile back. Seemed a bit silly to have both the equals and not equals implementation when they're so similar.

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