Tweaks after rereading the rendered version

USERGUIDE.md

@@ -214,19 +214,19 @@ Currently in the built-in render pipeline, shadows only work when the primary ca
 
 *Crest* requires water depth information to attenuate large waves in shallow water, to generate foam near shorelines, and to provide shallow water shading. It is calculated by rendering the render geometry in the scene for each LOD from a top down perspective and recording the Y value of the surface.
 
-When the ocean is e.g. 250m deep, this will start to dampen 500m wavelengths, so it is recommended that the sea floor drop down to around this depth away from islands so that there is a smooth transition between shallow and deep water without a 'step' in the sea floor which appears as a discontinuity and/or line of foam on the surface.
+When the ocean is e.g. 250m deep, this will start to dampen 500m wavelengths, so it is recommended that the sea floor drop down to around this depth away from islands so that there is a smooth transition between shallow and deep water without a 'step' in the sea floor which appears as a discontinuity in the surface waves and/or a line of foam.
 
 One way to inform *Crest* of the seabed is to attach the *RegisterSeaFloorDepthInput* component. *Crest* will record the height of these objects every frame, so they can be dynamic.
 
 This dynamic update comes at a cost. For parts for of the seabed which are static, *Crest* has a mechanism for recording their heights just once, instead of updating every frame, using an ocean depth cache. The *main.unity* example scene has an example of a cache set up around the island. The cache GameObject is called *IslandDepthCache* and has a *OceanDepthCache* component attached. The following are the key points of its configuration:
 
 * The transform position X and Z are centered over the island
-* The transform position y value is set to the sea level
+* The transform position Y value is set to the sea level
 * The transform scale is set to 540 which sets the size of the cache. If gizmos are visible and the cache is selected, the area is demarcated with a white rectangle.
-* The *Camera Max Terrain Height* is the max height of any surfaces above the sea level that will render into the cache. If gizmos are visible and the cache is selected, this cutoff is visualised as a translucent gray rectangle.
-* The *Layer Names* field contains the layer that the island is assigned to - *Terrain*. Only objects in these layer(s) will render into the cache.
+* The *Camera Max Terrain Height* is the max height of any surfaces above the sea level that will render into the cache. If gizmos are visible and the cache is selected, this cut-off height is visualised as a translucent gray rectangle.
+* The *Layer Names* field contains the layer that the island is assigned to: *Terrain*. Only objects in these layer(s) will render into the cache.
 
-On startup, validation is done on the cache. Check the log for warnings and errors.
+On startup, validation is done on the cache (and on various other components of the *Crest* setup). Be sure to check the log for warnings and errors.
 
 At runtime, a child object underneath the cache will be created with the prefix *Draw_* it will have a material with a *Texture* property. By double clicking the icon to the right of this field, one can inspect the contents of the cache.