Re-render function docs

docs/api/nfnl/config.md

@@ -5,6 +5,7 @@
 - [`cfg-fn`](#cfg-fn)
 - [`config-file-path?`](#config-file-path)
 - [`default`](#default)
+- [`find`](#find)
 - [`find-and-load`](#find-and-load)
 
 ## `cfg-fn`
@@ -34,7 +35,25 @@ Function signature:
 (default opts)
 ```
 
-**Undocumented**
+Returns the default configuration that you should base your custom
+  configuration on top of. Feel free to call this with no arguments and merge
+  your changes on top. If you wish, you can override opts.root-dir (which
+  defaults to the dir of your .nfnl.fnl project root and the CWD as a backup)
+  to whatever you need. The defaults with no arguments should be exactly what
+  you need in most cases though.
+
+  Make sure you update the README whenever you change the default
+  configuration!
+
+## `find`
+Function signature:
+
+```
+(find dir)
+```
+
+Find the nearest .nfnl.fnl file to the given directory. Returns the absolute
+  path to the found file or nil.
 
 ## `find-and-load`
 Function signature:

docs/api/nfnl/core.md

@@ -426,10 +426,10 @@ Return the first truthy result from (f x) or nil.
 Function signature:
 
 ```
-(spit path content)
+(spit path content opts)
 ```
 
-Spit the string into the file.
+Spit the string into the file. When opts.append is true, add to the file.
 
 ## `str`
 Function signature: