break: add page (#15238)

Create break.md

pages/common/break.md

@@ -0,0 +1,12 @@
+# break
+
+> Break out of a `for`, `while`, `until` or `select` loop.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-break>.
+
+- Break out of a single loop:
+
+`while :; do break; done`
+
+- Break out of nested loops:
+
+`while :; do while :; do break 2; done; done`