compopt, disown, help, unset: move to common (#14029)

pages/common/compopt.md

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+# compopt
+
+> Print or change the completion options for a command.
+> More information: <https://manned.org/compopt>.
+
+- Print the options for the currently executing completion:
+
+`compopt`
+
+- Print the completion options for given command:
+
+`compopt {{command}}`

pages/common/disown.md

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+# disown
+
+> Allow sub-processes to live beyond the shell that they are attached to.
+> See also the `jobs` command.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-disown>.
+
+- Disown the current job:
+
+`disown`
+
+- Disown a specific job:
+
+`disown %{{job_number}}`
+
+- Disown all jobs:
+
+`disown -a`
+
+- Keep job (do not disown it), but mark it so that no future SIGHUP is received on shell exit:
+
+`disown -h %{{job_number}}`

pages/common/help.md

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+# help
+
+> Display information about Bash builtin commands.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-help>.
+
+- Display the full list of builtin commands:
+
+`help`
+
+- Print instructions on how to use the `while` loop construct:
+
+`help while`
+
+- Print instructions on how to use the `for` loop construct:
+
+`help for`
+
+- Print instructions on how to use `[[ ]]` for conditional commands:
+
+`help [[ ]]`
+
+- Print instruction on how to use `(( ))` to evaluate arithmetic expressions:
+
+`help \( \)`
+
+- Print instructions on how to use the `cd` command:
+
+`help cd`

pages/common/unset.md

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+# unset
+
+> Remove shell variables or functions.
+> More information: <https://manned.org/unset>.
+
+- Remove the variable `foo`, or if the variable doesn't exist, remove the function `foo`:
+
+`unset {{foo}}`
+
+- Remove the variables foo and bar:
+
+`unset -v {{foo}} {{bar}}`
+
+- Remove the function my_func:
+
+`unset -f {{my_func}}`