Clarify wording of what lines need to be

Previously, the rule for blank lines technically did not cover
empty lines.  Clarify that leading and trailing whitespace are ignored
on all lines.

conf.py

@@ -21,8 +21,8 @@
 copyright = '2019--2024, EditorConfig Team'
 author = 'EditorConfig Team'
 
-version = '0.16.0'
-release = '0.16.0'
+version = '0.16.1'
+release = '0.16.1'
 
 # -- General configuration ---------------------------------------------------
 

index.rst

@@ -1,4 +1,4 @@
-..  Copyright (c) 2019--2020 EditorConfig Team
+..  Copyright (c) 2019--2024 EditorConfig Team
     All rights reserved.
 
     Redistribution and use in source and binary forms, with or without
@@ -73,15 +73,19 @@ EditorConfig organization.
 File Format
 ===========
 
+.. versionchanged:: 0.16.1
+
 EditorConfig files are in an INI-like file format.
-In an EditorConfig file, all beginning whitespace on each line is considered
-irrelevant. Each line must be one of the following:
+To read an EditorConfig file, take one line at a time.  For each line:
+
+#. Strip all leading and trailing whitespace
+#. If the remaining text is not empty, process the text as specified for its
+   type below.
+
+The types of lines are:
 
-- Blank: contains only whitespace characters.
 - Comment: starts with a ``;`` or a ``#``.
 - Section Header: starts with a ``[`` and ends with a ``]``.
-   - May not use any non-whitespace characters outside of the surrounding
-     brackets.
    - May contain any characters between the square brackets (e.g.,
      ``[`` and ``]`` and even spaces and tabs are allowed).
    - Forward slashes (``/``) are used as path separators.