[docs] Adjust symfony/* constraints to use tilde operator

This will hopefully make upgrade to 2.2 more seamless

doc/cookbook/validator_yaml.rst

@@ -11,7 +11,7 @@ your ``composer.json`` file:
 .. code-block:: json
 
     "require": {
-        "symfony/yaml": "2.1.*"
+        "symfony/yaml": "~2.1"
     }
 
 Next, you need to tell the Validation Service that you are not using

doc/providers/form.rst

@@ -55,7 +55,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/form": "2.1.*"
+            "symfony/form": "~2.1"
         }
 
     If you are going to use the validation extension with forms, you must also
@@ -65,9 +65,9 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/validator": "2.1.*",
-            "symfony/config": "2.1.*",
-            "symfony/translation": "2.1.*"
+            "symfony/validator": "~2.1",
+            "symfony/config": "~2.1",
+            "symfony/translation": "~2.1"
         }
 
     The Symfony Form Component relies on the PHP intl extension. If you don't have
@@ -76,7 +76,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/locale": "2.1.*"
+            "symfony/locale": "~2.1"
         }
 
     If you want to use forms in your Twig templates, make sure to install the
@@ -85,7 +85,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/twig-bridge": "2.1.*"
+            "symfony/twig-bridge": "~2.1"
         }
 
 Usage

doc/providers/security.rst

@@ -60,7 +60,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/security": "2.1.*"
+            "symfony/security": "~2.1"
         }
 
 .. caution::

doc/providers/translation.rst

@@ -50,7 +50,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/translation": "2.1.*"
+            "symfony/translation": "~2.1"
         }
 
 Usage
@@ -126,8 +126,8 @@ file:
 .. code-block:: json
 
     "require": {
-        "symfony/config": "2.1.*",
-        "symfony/yaml": "2.1.*"
+        "symfony/config": "~2.1",
+        "symfony/yaml": "~2.1"
     }
 
 Next, you have to create the language mappings in YAML files. A naming you can

doc/providers/twig.rst

@@ -60,7 +60,7 @@ some Symfony2 components and Twig. Add it as a dependency to your
 .. code-block:: json
 
     "require": {
-        "symfony/twig-bridge": "2.1.*",
+        "symfony/twig-bridge": "~2.1",
     }
 
 When present, the ``TwigServiceProvider`` will provide you with the following

doc/providers/validator.rst

@@ -44,7 +44,7 @@ Registering
     .. code-block:: json
 
         "require": {
-            "symfony/validator": "2.1.*"
+            "symfony/validator": "~2.1"
         }
 
 Usage