fixup! fixup! fixup! fixup! src,lib: initial ffi implementation

Author: bengl

doc/api/errors.md

@@ -3614,7 +3614,7 @@ The native call from `process.cpuUsage` could not be processed.
 [`dgram.disconnect()`]: dgram.md#socketdisconnect
 [`dgram.remoteAddress()`]: dgram.md#socketremoteaddress
 [`errno`(3) man page]: https://man7.org/linux/man-pages/man3/errno.3.html
-[`ffi.getNativeFunction()`]: ffi.md#ffigetnativefunctionlibrary-func-retType-argtypes
+[`ffi.getNativeFunction()`]: ffi.md#ffigetnativefunctionlibrary-func-rettype-argtypes
 [`fs.Dir`]: fs.md#class-fsdir
 [`fs.cp()`]: fs.md#fscpsrc-dest-options-callback
 [`fs.readFileSync`]: fs.md#fsreadfilesyncpath-options

doc/api/ffi.md

@@ -29,7 +29,7 @@ import ffi from 'ffi';
 const ffi = require('ffi');
 ```
 
-### Supported Types
+## Supported Types
 
 The following types are supported.
 

doc/api/index.md

@@ -31,6 +31,7 @@
 * [Errors](errors.md)
 * [Events](events.md)
 * [File system](fs.md)
+* [Foreign Function Interface](ffi.md)
 * [Globals](globals.md)
 * [HTTP](http.md)
 * [HTTP/2](http2.md)