docs: fix repl docs

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---

Author: headlessNode

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

@@ -9,7 +9,8 @@
     Indexing is relative to the first index. To introduce an offset, use typed
     array views.
 
-    If `N <= 0`, the function returns `-1`.
+    If `N <= 0` or no element passes a test implemented by a predicate function,
+    the function returns `-1`.
 
     The callback function is provided the following arguments:
 

lib/node_modules/@stdlib/blas/ext/base/gfind-index/docs/types/index.d.ts

@@ -104,7 +104,7 @@ interface Routine {
 	* @param strideX - stride length
 	* @param clbk - callback function
 	* @param thisArg - execution context
-	* @returns `index`
+	* @returns index
 	*
 	* @example
 	* function isEven( v ) {
@@ -136,7 +136,7 @@ interface Routine {
 	* @param offsetX - starting index
 	* @param clbk - callback function
 	* @param thisArg - execution context
-	* @returns `index`
+	* @returns index
 	*
 	* @example
 	* function isEven( v ) {
@@ -168,7 +168,7 @@ interface Routine {
 * @param strideX - stride length
 * @param clbk - callback function
 * @param thisArg - execution context
-* @returns `index`
+* @returns index
 *
 * @example
 * function isEven( v ) {