[1.7.x] Fixed #23169 - Misc docs fixes.

Backport of e4dd8b5dde from master

docs/ref/forms/fields.txt

@@ -279,7 +279,7 @@ as the rendered output.
 See the :ref:`format localization <format-localization>` documentation for
 more information.
 
-.. _built-in fields:
+.. _built-in-fields:
 
 Built-in ``Field`` classes
 --------------------------
@@ -407,7 +407,7 @@ For each field, we describe the default widget used if you don't specify
 
     If no ``input_formats`` argument is provided, the default input formats are::
 
-        ['%Y-%m-%d',       # '2006-10-25'
+        ['%Y-%m-%d',      # '2006-10-25'
         '%m/%d/%Y',       # '10/25/2006'
         '%m/%d/%y']       # '10/25/06'
 
@@ -930,12 +930,12 @@ Slightly complex built-in ``Field`` classes
                 def __init__(self, *args, **kwargs):
                     # Define one message for all fields.
                     error_messages = {
-                        'incomplete': 'Enter a country code and phone number.',
+                        'incomplete': 'Enter a country calling code and a phone number.',
                     }
                     # Or define a different message for each field.
                     fields = (
-                        CharField(error_messages={'incomplete': 'Enter a country code.'},
-                                  validators=[RegexValidator(r'^\d+$', 'Enter a valid country code.')]),
+                        CharField(error_messages={'incomplete': 'Enter a country calling code.'},
+                                  validators=[RegexValidator(r'^\d+$', 'Enter a valid country calling code.')]),
                         CharField(error_messages={'incomplete': 'Enter a phone number.'},
                                   validators=[RegexValidator(r'^\d+$', 'Enter a valid phone number.')]),
                         CharField(validators=[RegexValidator(r'^\d+$', 'Enter a valid extension.')],

docs/ref/forms/widgets.txt

@@ -27,7 +27,7 @@ Specifying widgets
 Whenever you specify a field on a form, Django will use a default widget
 that is appropriate to the type of data that is to be displayed. To find
 which widget is used on which field, see the documentation about
-:ref:`built-in fields`.
+:ref:`built-in-fields`.
 
 However, if you want to use a different widget for a field, you can
 just use the :attr:`~Field.widget` argument on the field definition. For

docs/topics/http/file-uploads.txt

@@ -26,7 +26,7 @@ Consider a simple form containing a :class:`~django.forms.FileField`::
 
     class UploadFileForm(forms.Form):
         title = forms.CharField(max_length=50)
-        file  = forms.FileField()
+        file = forms.FileField()
 
 A view handling this form will receive the file data in
 :attr:`request.FILES <django.http.HttpRequest.FILES>`, which is a dictionary