documentation: prefer https

README.md

@@ -192,11 +192,11 @@ If *angle* is specified, sets the projection’s post-projection planar rotation
 
 <a href="#projection_rotate" name="projection_rotate">#</a> <i>projection</i>.<b>rotate</b>([<i>angles</i>]) [<>](https://github.com/d3/d3-geo/blob/master/src/projection/index.js "Source")
 
-If *rotation* is specified, sets the projection’s [three-axis spherical rotation](https://bl.ocks.org/mbostock/4282586) to the specified *angles*, which must be a two- or three-element array of numbers [*lambda*, *phi*, *gamma*] specifying the rotation angles in degrees about [each spherical axis](https://bl.ocks.org/mbostock/4282586). (These correspond to [yaw, pitch and roll](http://en.wikipedia.org/wiki/Aircraft_principal_axes).) If the rotation angle *gamma* is omitted, it defaults to 0. See also [d3.geoRotation](#geoRotation). If *rotation* is not specified, returns the current rotation which defaults [0, 0, 0].
+If *rotation* is specified, sets the projection’s [three-axis spherical rotation](https://bl.ocks.org/mbostock/4282586) to the specified *angles*, which must be a two- or three-element array of numbers [*lambda*, *phi*, *gamma*] specifying the rotation angles in degrees about [each spherical axis](https://bl.ocks.org/mbostock/4282586). (These correspond to [yaw, pitch and roll](https://en.wikipedia.org/wiki/Aircraft_principal_axes).) If the rotation angle *gamma* is omitted, it defaults to 0. See also [d3.geoRotation](#geoRotation). If *rotation* is not specified, returns the current rotation which defaults [0, 0, 0].
 
 <a href="#projection_precision" name="projection_precision">#</a> <i>projection</i>.<b>precision</b>([<i>precision</i>]) [<>](https://github.com/d3/d3-geo/blob/master/src/projection/index.js "Source")
 
-If *precision* is specified, sets the threshold for the projection’s [adaptive resampling](https://bl.ocks.org/mbostock/3795544) to the specified value in pixels and returns the projection. This value corresponds to the [Douglas–Peucker](http://en.wikipedia.org/wiki/Ramer–Douglas–Peucker_algorithm) distance. If *precision* is not specified, returns the projection’s current resampling precision which defaults to √0.5 ≅ 0.70710…
+If *precision* is specified, sets the threshold for the projection’s [adaptive resampling](https://bl.ocks.org/mbostock/3795544) to the specified value in pixels and returns the projection. This value corresponds to the [Douglas–Peucker](https://en.wikipedia.org/wiki/Ramer–Douglas–Peucker_algorithm) distance. If *precision* is not specified, returns the projection’s current resampling precision which defaults to √0.5 ≅ 0.70710…
 
 <a href="#projection_fitExtent" name="projection_fitExtent">#</a> <i>projection</i>.<b>fitExtent</b>(<i>extent</i>, <i>object</i>) [<>](https://github.com/d3/d3-geo/blob/master/src/projection/index.js "Source")
 
@@ -448,7 +448,7 @@ Returns true if and only if the specified GeoJSON *object* contains the specifie
 
 <a name="geoRotation" href="#geoRotation">#</a> d3.<b>geoRotation</b>(<i>angles</i>) [<>](https://github.com/d3/d3-geo/blob/master/src/rotation.js "Source")
 
-Returns a [rotation function](#_rotation) for the given *angles*, which must be a two- or three-element array of numbers [*lambda*, *phi*, *gamma*] specifying the rotation angles in degrees about [each spherical axis](https://bl.ocks.org/mbostock/4282586). (These correspond to [yaw, pitch and roll](http://en.wikipedia.org/wiki/Aircraft_principal_axes).) If the rotation angle *gamma* is omitted, it defaults to 0. See also [*projection*.rotate](#projection_rotate).
+Returns a [rotation function](#_rotation) for the given *angles*, which must be a two- or three-element array of numbers [*lambda*, *phi*, *gamma*] specifying the rotation angles in degrees about [each spherical axis](https://bl.ocks.org/mbostock/4282586). (These correspond to [yaw, pitch and roll](https://en.wikipedia.org/wiki/Aircraft_principal_axes).) If the rotation angle *gamma* is omitted, it defaults to 0. See also [*projection*.rotate](#projection_rotate).
 
 <a name="_rotation" href="#_rotation">#</a> <i>rotation</i>(<i>point</i>) [<>](https://github.com/d3/d3-geo/blob/master/src/rotation.js "Source")