docs: fix hyphenation

Fix formatting of the documentation for snanmean.

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

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/snanmean/docs/repl.txt

@@ -1,7 +1,7 @@
 
 {{alias}}( arrays )
-    Computes the arithmetic mean of a one-dimensional single-precision floating
-    -point ndarray, ignoring `NaN` values.
+    Computes the arithmetic mean of a one-dimensional single-precision floating-
+    point ndarray, ignoring `NaN` values.
 
     If provided an empty ndarray, the function returns `NaN`.