doc: fix some small issues

source/components/form/api-button.mjs

source/components/form/context-error.mjs

source/components/form/context-help.mjs

source/components/form/message-state-button.mjs

source/components/form/popper-button.mjs

source/components/form/select.mjs

source/components/form/toggle-switch.mjs

source/components/form/tree-select.mjs