Improve documentation on requirements.yml (#76140)

Makes it clear that user can use range identifiers with collection
versions inside requirements.yml files.

docs/docsite/rst/galaxy/user_guide.rst

@@ -330,12 +330,12 @@ You can install roles and collections from the same requirements files
     roles:
       # Install a role from Ansible Galaxy.
       - name: geerlingguy.java
-        version: 1.9.6
+        version: "1.9.6" # note that ranges are not supported for roles
 
     collections:
       # Install a collection from Ansible Galaxy.
       - name: geerlingguy.php_roles
-        version: 0.9.3
+        version: ">=0.9.3"
         source: https://galaxy.ansible.com
 
 Installing multiple roles from multiple files

docs/docsite/rst/shared_snippets/installing_multiple_collections.txt

@@ -10,8 +10,8 @@ You can set up a ``requirements.yml`` file to install multiple collections in on
 
    # With the collection name, version, and source options
    - name: my_namespace.my_other_collection
-     version: 'version range identifiers (default: ``*``)'
-     source: 'The Galaxy URL to pull the collection from (default: ``--api-server`` from cmdline)'
+     version: ">=1.2.0" # Version range identifiers (default: ``*``)
+     source: ... # The Galaxy URL to pull the collection from (default: ``--api-server`` from cmdline)
 
 You can specify the following keys for each collection entry:
 
@@ -56,12 +56,13 @@ You can also add roles to a ``requirements.yml`` file, under the ``roles`` key.
     roles:
       # Install a role from Ansible Galaxy.
       - name: geerlingguy.java
-        version: 1.9.6
+        version: "1.9.6" # note that ranges are not supported for roles
+
 
     collections:
       # Install a collection from Ansible Galaxy.
       - name: geerlingguy.php_roles
-        version: 0.9.3
+        version: ">=0.9.3"
         source: https://galaxy.ansible.com
 
 To install both roles and collections at the same time with one command, run the following: