index.en: add missing word

content/_index.en.md

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-StuStaNet is an association in the Studentenstadt Freimann that operates a computer network connecting the Studentenstadt as well as the dormitory Max-Bill-Straße 67 to the Internet. The network operated entirely by volunteers and has about {{< users >}} users.
+StuStaNet is an association in the Studentenstadt Freimann that operates a computer network connecting the Studentenstadt as well as the dormitory Max-Bill-Straße 67 to the Internet. The network, which is operated entirely by volunteers, has about {{< users >}} users.
 
 ## Become a Member