docs: v.kernel.html minor edits (OSGeo#4788)

vector/v.kernel/v.kernel.html

@@ -1,11 +1,10 @@
 <h2>DESCRIPTION</h2>
 
 <em>v.kernel</em> generates a raster density map from vector points
-data using a moving
-kernel. Available <a href="https://en.wikipedia.org/wiki/Kernel_(statistics)#Kernel_functions_in_common_use">kernel
+data using a moving kernel. Available <a href="https://en.wikipedia.org/wiki/Kernel_(statistics)#Kernel_functions_in_common_use">kernel
 density functions</a> are <em>uniform, triangular, epanechnikov,
-quartic, triweight, gaussian, cosine</em>, default
-is <em>gaussian</em>.
+quartic, triweight, gaussian, cosine</em>. The default function is <em>gaussian</em>.
+
 <p>The module can also generate a vector density map on a vector network.
 Conventional kernel functions produce biased estimates by overestimating
 the densities around network nodes, whereas the equal split method of