rails: change rg alias to `rgen` (#7858)

The rg alias conflicted with ripgrep.

plugins/rails/README.md

@@ -18,7 +18,7 @@ plugins=(... rails)
 | `rcs` | `rails console --sandbox`  | Test code in a sandbox, without changing any data  |
 | `rd`  | `rails destroy`            | Undo a generate operation                          |
 | `rdb` | `rails dbconsole`          | Interact with your db from the console             |
-| `rg`  | `rails generate`           | Generate boilerplate code                          |
+| `rgen`  | `rails generate`           | Generate boilerplate code                          |
 | `rgm` | `rails generate migration` | Generate a db migration                            |
 | `rp`  | `rails plugin`             | Run a Rails plugin command                         |
 | `ru`  | `rails runner`             | Run Ruby code in the context of Rails              |

plugins/rails/rails.plugin.zsh

@@ -43,7 +43,7 @@ alias rc='rails console'
 alias rcs='rails console --sandbox'
 alias rd='rails destroy'
 alias rdb='rails dbconsole'
-alias rg='rails generate'
+alias rgen='rails generate'
 alias rgm='rails generate migration'
 alias rp='rails plugin'
 alias ru='rails runner'