Update cheatsheets

tldr/jj-next

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jj next
+
+> Move the working-copy commit to a child revision.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-next>.
+
+- Move the working-copy commit to the next child revision:
+
+`jj next`
+
+- Move the working-copy commit a number of revisions forward:
+
+`jj next {{offset}}`
+
+- Edit the child revision directly, instead of creating a new working-copy commit:
+
+`jj next {{[-e|--edit]}}`
+
+- Create a new working-copy commit instead of editing the child revision directly:
+
+`jj next {{[-n|--no-edit]}}`
+
+- Jump to the next conflicted child:
+
+`jj next --conflict`