Add -expand-relocs to llvm-readobj

This option expands shown relocations from single line to a dictionary
format:

  Relocation {
    Offset: 0x4
    Type: R_386_32 (1)
    Symbol: sym
    Info: 0x0
  }

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179359 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/llvm-readobj.rst b/docs/CommandGuide/llvm-readobj.rst
index 3ede21d..1ca0b19 100644
--- a/docs/CommandGuide/llvm-readobj.rst
+++ b/docs/CommandGuide/llvm-readobj.rst
@@ -63,6 +63,11 @@
 
  Display unwind information.
 
+.. option:: -expand-relocs
+
+ When used with ``-relocations``, display each relocation in an expanded
+ multi-line format.
+
 .. option:: -dynamic-table
 
  Display the ELF .dynamic section table (only for ELF object files).