Fix typo in binutils manual

I happened to notice that the binutils manual has a typo in the name
of a command-line option.



diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
index 4e67b6e..c78c9e3 100644
--- a/binutils/doc/binutils.texi
+++ b/binutils/doc/binutils.texi
@@ -2042,7 +2042,7 @@
 locations before the debugger is run everything should work
 correctly.
 
-@item --keep-section-symbils
+@item --keep-section-symbols
 When stripping a file, perhaps with @option{--strip-debug} or
 @option{--strip-unneeded}, retain any symbols specifying section names,
 which would otherwise get stripped.