Add a description about multiple linker scripts

Differential Revision: https://reviews.llvm.org/D66630

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@369737 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ld.lld.1 b/docs/ld.lld.1
index c432aac..f971157 100644
--- a/docs/ld.lld.1
+++ b/docs/ld.lld.1
@@ -424,6 +424,8 @@
 .It Fl -script Ns = Ns Ar file , Fl T Ar file
 Read linker script from
 .Ar file .
+If multiple linker scripts are given, they are processed as if they
+were concatenated in the order they appeared on the command line.
 .It Fl -section-start Ns = Ns Ar section Ns = Ns Ar address
 Set address of section.
 .It Fl -shared , Fl -Bsharable