[llvm] Proofread BigEndianNEON.rst#156141

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_20250829_proofread_BigEndianNEONkazutakahirata/llvm-project:cleanup_20250829_proofread_BigEndianNEONCopy head branch name to clipboard