[llvm-readobj] set --elf-cg-profile as alias of --cg-profile

Summary: Rename --elf-cg-profile to --cg-profile and keep --elf-cg-profile as an alias of --cg-profile.

Reviewers: jhenderson, MaskRay, espindola, hans

Reviewed By: jhenderson, MaskRay

Subscribers: emaste, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81855
diff --git a/llvm/docs/CommandGuide/llvm-readelf.rst b/llvm/docs/CommandGuide/llvm-readelf.rst
index 2868d0b..f74f02c 100644
--- a/llvm/docs/CommandGuide/llvm-readelf.rst
+++ b/llvm/docs/CommandGuide/llvm-readelf.rst
@@ -52,7 +52,7 @@
 
  Display the dynamic table.
 
-.. option:: --elf-cg-profile
+.. option:: --cg-profile
 
  Display the callgraph profile section.
 
diff --git a/llvm/docs/CommandGuide/llvm-readobj.rst b/llvm/docs/CommandGuide/llvm-readobj.rst
index 46a4b87..51cd266 100644
--- a/llvm/docs/CommandGuide/llvm-readobj.rst
+++ b/llvm/docs/CommandGuide/llvm-readobj.rst
@@ -168,7 +168,7 @@
 
  Display the dynamic table.
 
-.. option:: --elf-cg-profile
+.. option:: --cg-profile
 
  Display the callgraph profile section.