Rename "babylon" with "babel" (#5647)

docs/api.md

@@ -12,7 +12,7 @@ const prettier = require("prettier");
 `format` is used to format text using Prettier. [Options](options.md) may be provided to override the defaults.
 
 ```js
-prettier.format("foo ( );", { semi: false, parser: "babylon" });
+prettier.format("foo ( );", { semi: false, parser: "babel" });
 // -> "foo()"
 ```
 
@@ -27,7 +27,7 @@ prettier.format("foo ( );", { semi: false, parser: "babylon" });
 The `cursorOffset` option should be provided, to specify where the cursor is. This option cannot be used with `rangeStart` and `rangeEnd`.
 
 ```js
-prettier.formatWithCursor(" 1", { cursorOffset: 2, parser: "babylon" });
+prettier.formatWithCursor(" 1", { cursorOffset: 2, parser: "babel" });
 // -> { formatted: '1;\n', cursorOffset: 1 }
 ```
 
@@ -130,8 +130,8 @@ Prettier's built-in parsers are exposed as properties on the `parsers` argument.
 
 ```js
 prettier.format("lodash ( )", {
-  parser(text, { babylon }) {
-    const ast = babylon(text);
+  parser(text, { babel }) {
+    const ast = babel(text);
     ast.program.body[0].expression.callee.name = "_";
     return ast;
   }