[llvm-readobj][ELF] s/dyn_rela_/dyn_rel_/ No functional changes.
[llvm-readobj][ELF] s/dyn_rela_/dyn_rel_/ No functional changes.

Follow up to r258001. These template functions might return both REL and RELA
relocations. The 'rel' noun looks less ambiguous.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@258060 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm