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[PATCH 1/4] Doc/config.txt: explain repeated sections

Add a paragraph explaining what happens when a section name is repeated
in the configuration file(s).

The example configuration file shown in this document already implied
Git's behaviour, this patch simply tries to make it explicit.

Signed-off-by: astian <astian@xxxxxxxxxx>
 Documentation/config.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index d5c9c4cab..afce25705 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -31,6 +31,10 @@ characters, `-` and `.` are allowed in section names.  Each variable
 must belong to some section, which means that there must be a section
 header before the first setting of a variable.
+Multiple occurrences of the same section are all logically merged.  (There's
+no special treatment for variables defined multiple times across physically
+different sections, the variable is simply made multivalued.)
 Sections can be further divided into subsections.  To begin a subsection
 put its name in double quotes, separated by space from the section name,
 in the section header, like in the example below: