doc: update to reflect new command line switch

Re nodejs/node#11975 (comment)

Author: Gabriel Schulhof

doc/api/cli.md

@@ -144,6 +144,13 @@ added: v6.0.0
 
 Silence all process warnings (including deprecations).
 
+### `--napi-modules[=yes|no]`
+<!-- YAML
+added: v8.0.0
+-->
+
+Load N-API modules (default no).
+
 ### `--trace-warnings`
 <!-- YAML
 added: v6.0.0

doc/node.1

@@ -119,6 +119,10 @@ Throw errors for deprecations.
 .BR \-\-no\-warnings
 Silence all process warnings (including deprecations).
 
+.TP
+.BR \-\-napi\-modules \fI[=yes|no]\fR
+Load N-API modules (default no).
+
 .TP
 .BR \-\-trace\-warnings
 Print stack traces for process warnings (including deprecations).