Fix type in the Release Notes.

Thanks to Martin Storsjö for noticing it!


git-svn-id: https://llvm.org/svn/llvm-project/lld/branches/release_60@326103 91177308-0d34-0410-b5e6-96231b3b80d8

Author: espindola

docs/ReleaseNotes.rst

@@ -57,7 +57,7 @@ ELF Improvements
 * lld can now identify and patch a code sequence that triggers AArch64 errata 843419.
   Add ``--fix-cortex-a53-843419`` to enable the feature.
 
-* lld can now generate thunks for out of range thunks.
+* lld can now generate thunks for out of range branches.
 
 * MIPS port now generates all output dynamic relocations using Elf_Rel format only.