fix page hook description
fix page hook description

gmassanek/gitbook-plugin-js-sequence-diagram,nicgirault/gitbook-plugin-circosjs,kmelve/gitbook-plugin-typekit,todvora/gitbook-plugin-image-captions,genomecompilermanual/gitbook_plugin,GitbookIO/plugin,todvora/gitbook-plugin-image-captions,pm5/gitbook-plugin-lexicon,gaearon/gitbook-plugin-prism,spricity/google_code_prettify,Noamyoungerm/gitbook-plugin-base