docs: fix missing comma

Author: kgryte

lib/node_modules/@stdlib/blas/base/dnrm2-wasm/docs/repl.txt

@@ -8,7 +8,7 @@
     Indexing is relative to the first index. To introduce an offset, use typed
     array views.
 
-    If `N <= 0` the function returns `0.0`.
+    If `N <= 0`, the function returns `0.0`.
 
     Parameters
     ----------