Add documentation on YAML floating-point values (#17182)

docsite/rst/YAMLSyntax.rst

@@ -143,6 +143,14 @@ In these cases just use quotes::
     other_string: "False"
 
 
+YAML converts certain strings into floating-point values, such as the string
+`1.0`. If you need to specify a version number (in a requirements.yml file, for
+example), you will need to quote the value if it looks like a floating-point
+value::
+
+  version: "1.0"
+
+
 .. seealso::
 
    :doc:`playbooks`

docsite/rst/galaxy.rst

@@ -132,7 +132,7 @@ Use the following example as a guide for specifying roles in *requirements.yml*:
     # from GitLab or other git-based scm
     - src: git@gitlab.company.com:mygroup/ansible-base.git
       scm: git
-      version: 0.1.0
+      version: "0.1"  # quoted, so YAML doesn't parse this as a floating-point value
 
 Dependencies
 ============