doc: add missing word in rootCertificates section

PR-URL: nodejs/node#42633
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: tniessen

doc/api/tls.md

@@ -2145,7 +2145,7 @@ added: v12.3.0
 * {string\[]}
 
 An immutable array of strings representing the root certificates (in PEM format)
-from the bundled Mozilla CA store as supplied by current Node.js version.
+from the bundled Mozilla CA store as supplied by the current Node.js version.
 
 The bundled CA store, as supplied by Node.js, is a snapshot of Mozilla CA store
 that is fixed at release time. It is identical on all supported platforms.