Corrected the fixed width example in doc
Corrected the fixed width example in doc

trusktr/tooltipster,andersonunsonst/tooltipster,cswef/tooltipster_cn,trusktr/tooltipster,MIKUScallion/tooltipster_cn,andersonunsonst/tooltipster,iamceege/tooltipster,cswef/tooltipster_cn,iamceege/tooltipster,MIKUScallion/tooltipster_cn