docs: add inherit to language overview (#10194)

* docs: add inherit to language overview

Adds a short summary about `inherit` to the language overview.

doc/manual/src/language/index.md

@@ -432,6 +432,32 @@ This is an incomplete overview of language features, by example.
 
   </td>
  </tr>
+ <tr>
+  <td>
+
+   `inherit pkgs src;`
+
+  </td>
+  <td>
+
+   Adds the variables to the current scope (attribute set or `let` binding).
+   Desugars to `pkgs = pkgs; src = src;`
+
+  </td>
+ </tr>
+ <tr>
+  <td>
+
+   `inherit (pkgs) lib stdenv;`
+
+  </td>
+  <td>
+
+   Adds the attributes, from the attribute set in parentheses, to the current scope (attribute set or `let` binding).
+   Desugars to `lib = pkgs.lib; stdenv = pkgs.stdenv;`
+
+  </td>
+ </tr>
  <tr>
   <td>