setopt: add page (#19641)

Co-authored-by: Sahil Afrid Farookhi <[email protected]>
Co-authored-by: Lena Pastwa <[email protected]>
Co-authored-by: Managor <[email protected]>
Co-authored-by: Meinard Francisco <[email protected]>

Author: 5 people

pages/common/setopt.md

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+# setopt
+
+> Set Z shell (`zsh`) options.
+> Note: Zsh options are case-insensitive and underscores are ignored.
+> See also: `unsetopt` to unset options.
+> More information: <https://zsh.sourceforge.io/Doc/Release/Options.html>.
+
+- List enabled options:
+
+`setopt`
+
+- Set an option:
+
+`setopt {{option}}`
+
+- Display all available options and their status:
+
+`set -o`