Small documentation improvements

Author: BlackEdder

source/ggplotd/aes.d

@@ -553,7 +553,8 @@ unittest
     // Test whether type/ordering is consistent
     // Given enough benefit we can break this, but we'll have to adapt plotcli to match,
     // which to be fair is relatively straightforward
-    static assert( is(Tuple!(string, "colour", double, "size", double, "angle", double, "alpha", bool, "mask", double, "fill", double, "x", double, "y", string, "label") == typeof(merged) ) );
+    static assert( is(Tuple!(string, "colour", double, "size", double, "angle", double, "alpha", 
+        bool, "mask", double, "fill", double, "x", double, "y", string, "label") == typeof(merged) ) );
 }
 
 /// 

source/ggplotd/axes.d

@@ -35,6 +35,7 @@ struct Axis
     /// Offset of the axis
     double offset;
 
+    /// Show the axis or hide it
     bool show = true;
 }
 

source/ggplotd/ggplotd.d

@@ -123,10 +123,12 @@ private auto drawGeom( in Geom geom, ref cairo.Surface surface,
 /// Specify margins in number of pixels
 struct Margins
 {
+    /// Create new Margins object based on old one
     this(in Margins copy) {
         this(copy.left, copy.right, copy.bottom, copy.top);
     }
 
+    /// Create new Margins object based on specified sizes
     this(in size_t l, in size_t r, in size_t b, in size_t t) {
         left = l;
         right = r;

source/ggplotd/legend.d

@@ -15,8 +15,8 @@ private struct Legend
 Create a legend using a continuous scale
 
 Params:
-    width Optional width in pixels
-    height Optional height in pixels
+    width = Optional width in pixels
+    height = Optional height in pixels
 +/
 auto continuousLegend(int width = 80, int height = 70)
 {
@@ -27,8 +27,8 @@ auto continuousLegend(int width = 80, int height = 70)
 Create a legend using a discrete scale
 
 Params:
-    width Optional width in pixels
-    height Optional height in pixels
+    width = Optional width in pixels
+    height = Optional height in pixels
 +/
 auto discreteLegend(int width = 80, int height = 70)
 {