docs: update descriptions

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ztest/two-sample/results/struct-factory/lib/main.js

@@ -85,13 +85,13 @@ function factory( dtype ) {
 		},
 		{
 			'name': 'xmean',
-			'description': 'Sample mean of `x`',
+			'description': 'sample mean of `x`',
 			'type': dtype,
 			'castingMode': 'mostly-safe'
 		},
 		{
 			'name': 'ymean',
-			'description': 'Sample mean of `y`',
+			'description': 'sample mean of `y`',
 			'type': dtype,
 			'castingMode': 'mostly-safe'
 		}