Added short explanation to linedistance (#130)

Author: Chillee

content/geometry/lineDistance.h

@@ -5,12 +5,12 @@
  * Source: Basic math
  * Description:\\
 \begin{minipage}{75mm}
-Returns the signed distance between point p and the line containing points a and b. Positive value on left side and negative on right as seen from a towards b. a==b gives nan. P is supposed to be Point<T> or Point3D<T> where T is e.g. double or long long. It uses products in intermediate steps so watch out for overflow if using int or long long. Using Point3D will always give a non-negative distance.
+Returns the signed distance between point p and the line containing points a and b. Positive value on left side and negative on right as seen from a towards b. a==b gives nan. P is supposed to be Point<T> or Point3D<T> where T is e.g. double or long long. It uses products in intermediate steps so watch out for overflow if using int or long long. Using Point3D will always give a non-negative distance. For Point3D, call .dist on the result of the cross product.
 \end{minipage}
 \begin{minipage}{15mm}
 \includegraphics[width=\textwidth]{content/geometry/lineDistance}
 \end{minipage}
- * Status: tested 
+ * Status: tested
  */
 #pragma once