[gobject-introspection: 1/2] Fix syntax errors in gir-1.2.rnc

[Emmanuele Bassi <ebassi src gnome org>]

commit 0a4c329d39546e4775f41eb802b72172a42ff274
Author: Phil Clayton <phil clayton veonix com>
Date:   Sun Jan 17 19:34:32 2021 +0000

    Fix syntax errors in gir-1.2.rnc
    
    Closes #373

 docs/gir-1.2.rnc | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)
---
diff --git a/docs/gir-1.2.rnc b/docs/gir-1.2.rnc
index 6fa656c2..a6478119 100644
--- a/docs/gir-1.2.rnc
+++ b/docs/gir-1.2.rnc
@@ -262,18 +262,18 @@ grammar {
       attribute xml:whitespace { "preserve" }?,
       ## the text of the version of the documentation
       text
-    }?
+    }? &
     ## give the stability of the documentation
-    & element doc-stability {
+    element doc-stability {
       ## Preserve the original formatting of the documentation from the source code
       attribute xml:space { "preserve" }?,
       ## Preserve the original formatting of the documentation from the source code. Recommended to use this 
instead of xml:space
       attribute xml:whitespace { "preserve" }?,
       ## a text value about the stability of the documentation. Usually a simple description like stable or 
unstable
       text
-    }?
+    }? &
     ## documentation of an element
-    & element doc {
+    element doc {
       ## Preserve the original formatting of the documentation from the source code
       attribute xml:space { "preserve" }?,
       ## Keep the whitespace as they were in the source code
@@ -286,24 +286,24 @@ grammar {
       attribute column { xsd:string },
       ## the text of the documentation
       text
-    }?
+    }? &
     ## Deprecated documentation of an element. Kept for historical reasons in general
-    & element doc-deprecated {
+    element doc-deprecated {
       ## Preserve the original formatting of the documentation from the source code
       attribute xml:space { "preserve" }?,
       ## Keep the whitespace as they were in the source code
       attribute xml:whitespace { "preserve" }?,
       ## the text of the deprecated documentation
       text
-    }?
+    }? &
     ## Position of the documentation in the original source code
-    & element source-position {
+    element source-position {
       ## File name of the source of the documentation
       attribute filename { xsd:string },
       ## The first line of the documentation in the source code
       attribute line { xsd:string },
       ## The first column of the documentation in the source code
-      attribute column { xsd:string },
+      attribute column { xsd:string }
     }?
   )
 
@@ -532,10 +532,10 @@ grammar {
 
         (DocElements
          & (AnyType | VarArgs))
-      }*
+      }* &
 
       ## instance-parameter is a parameter of a C function which is an instance of an existing object. So 
the callable is surely a method of a class, and this parameter points to the instance of the object. In C++, 
this would be equivalent to the pointer this which is not passed to the method, in Python it's equivalent to 
self.
-      & element instance-parameter {
+      element instance-parameter {
         ## name of the instance-parameter
         attribute name { xsd:string },
         ## Binary attribute, true if the parameter can have a null value