man: fix copy/paste typo in mesonintrospect(1)
-.TH MESONCONF "1" "October 2017" "mesonintrospect 0.43.0" "User Commands"
+.TH MESONINTROSPECT "1" "October 2017" "mesonintrospect 0.43.0" "User Commands"
.SH NAME
mesonintrospect - a tool to extract information about a Meson build
.SH DESCRIPTION
