docs: fix type

Signed-off-by: Muhammad Haris <[email protected]>

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/base/slast-index-of/docs/repl.txt

@@ -19,7 +19,7 @@
     searchElement: number
         Search element.
 
-    x: Float64Array
+    x: Float32Array
         Input array.
 
     strideX: integer