chore: fix table sticky column file name

[andrewseguin]

The folder and filenames were different (sticky-column vs sticky-columns) which will be an issue for the docs site

[jelbourn]

LGTM

[ngbot]

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[Abhishek-Shrotriya]

Hi, is there any specific date when the sticky/ pinned columns (including horizontal and vertical scrolling) be publicly available, as there is critical need to freeze few columns in my project using Angular material table. Thanks for your help

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