docs: fix grammar

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Author: kgryte

lib/node_modules/@stdlib/array/index/README.md

@@ -26,7 +26,7 @@ limitations under the License.
 
 <section class="intro">
 
-In JavaScript, only strings and symbols are valid property names. When providing values for property names which are not string or symbols, the values are serialized to strings **prior to** attempting to access property values. For example, the following
+In JavaScript, only strings and symbols are valid property names. When providing values for property names which are not strings or symbols, the values are serialized to strings **prior to** attempting to access property values. For example, the following
 
 ```javascript
 // Create an array: