git-replace, w: add pages (#4496)

pages/common/git-replace.md

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+# git replace
+
+> Create, list, and delete refs to replace objects.
+> More information: <https://git-scm.com/docs/git-replace>.
+
+- Replace any commit with a different one, leaving other commits unchanged:
+
+`git replace {{object}} {{replacement}}`
+
+- Delete existing replace refs for the given objects:
+
+`git replace --delete {{object}}`
+
+- Edit an object’s content interactively:
+
+`git replace --edit {{object}}`

pages/linux/w.md

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+# w
+
+> Display who is logged in and their processes.
+> More information: <https://www.geeksforgeeks.org/w-command-in-linux-with-examples/>.
+
+- Display information about all users who are currently logged in:
+
+`w`
+
+- Display information about a specific user:
+
+`w {{user}}`
+
+- Display information without including the header:
+
+`w --no-header`
+
+- Display information without including the login, JCPU and PCPU columns:
+
+`w --short`