docs(man): add blank lines in the package help page

man/airGRteaching.Rd

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 \title{\packageTitle{airGRteaching}}
 
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 \description{
 airGRteaching is an add-on package to the airGR package that simplifies its use and is teaching oriented.
 It allows to use with very low programming skills several lumped rainfall-runoff models (GR4H, GR5H, GR4J, GR5J, GR6J, GR2M and GR1A) and a snow melt and accumulation model (CemaNeige). This package also provides graphical devices to help students to explore data and modelling results.