small README polish

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 friendica hovercard addon for the frio theme
 
 This addon provides a hovercard for firendicas frio theme.
-**It not intended to use the plugin without the frio theme or vice versa.
+
+**It not intended to use the plugin without the frio theme or vice versa.**
 
 It's a sample implementation how friendica could provide json userdata for
 the hovercard. Ideally we should implement something like a profile data api endpoint like