fix doc notes

Author: paul-buerkner

R/formula-gp.R

@@ -60,13 +60,13 @@
 #'
 #'  Below, we describe the currently supported covariance kernels:
 #'  \itemize{
-#'    \item{"exp_quad": }{The exponentiated-quadratic kernel is defined as
+#'    \item "exp_quad": The exponentiated quadratic kernel is defined as
 #'    \eqn{k(x_i, x_j) = sdgp^2 \exp(- || x_i - x_j ||^2 / (2 lscale^2))},
 #'    where \eqn{|| . ||} is the Euclidean norm, \eqn{sdgp} is a
 #'    standard deviation parameter, and \eqn{lscale} is characteristic
 #'    length-scale parameter. The latter practically measures how close two
 #'    points \eqn{x_i} and \eqn{x_j} have to be to influence each other
-#'    substantially.}
+#'    substantially.
 #'  }
 #'
 #'  In the current implementation, \code{"exp_quad"} is the only supported