Make file formatting comply with POSIX and Unix standards

UTF-8, LF, no BOM, and newlines at the end of files
diff --git a/doc/snippets/Slicing_arrayexpr.cpp b/doc/snippets/Slicing_arrayexpr.cpp
index 00b689b..2df8180 100644
--- a/doc/snippets/Slicing_arrayexpr.cpp
+++ b/doc/snippets/Slicing_arrayexpr.cpp
@@ -1,4 +1,4 @@
 ArrayXi ind(5); ind<<4,2,5,5,3;
 MatrixXi A = MatrixXi::Random(4,6);
 cout << "Initial matrix A:\n" << A << "\n\n";
-cout << "A(all,ind-1):\n" << A(all,ind-1) << "\n\n";
\ No newline at end of file
+cout << "A(all,ind-1):\n" << A(all,ind-1) << "\n\n";