docs: show how to cabal repl module NgxExport

Author: lyokha

aliases/README.md

@@ -1,4 +1,4 @@
-##### Aliases
+#### Aliases
 
 This module declares handy aliases for common patterns built of directives from
 Nginx Haskell module. The alias directives and their translations are listed in
@@ -21,7 +21,7 @@ expressions.
 
 No directive from this module requires loading a Haskell library.
 
-##### Build
+#### Build
 
 To build the module, add option
 `--add-module=/path/to/nginx-haskell-module/aliases` after option

docs/yet-another-doc-with-examples/test/README.md

@@ -1,4 +1,4 @@
-##### Building and installation
+#### Building and installation
 
 The build tool requires Cabal, [*patchelf*](https://github.com/NixOS/patchelf),
 and utility *nhm-tool* which is shipped with package *ngx-export-distribution*.

haskell/ngx-export/README.md

@@ -33,3 +33,9 @@ $ cabal v1-install ngx-export
 $ cabal build
 ```
 
+The module can be loaded in the *REPL* with
+
+```ShellSession
+$ cabal repl --repl-options=-fobject-code
+```
+