Merge pull request #415 from rui314/rui314-patch-1

Clarify ULEB128 note

Author: kito-cheng

riscv-elf.adoc

@@ -484,10 +484,11 @@ assembler syntax, including that of the relocations, is described in the
 _RISC-V Assembly Programmer's Manual_ <<rv-asm>>.
 
 [[uleb128-note]]
-NOTE: The assembler must allocate enough space to accommodate ULEB128 data for
-`R_RISCV_SET_ULEB128` and `R_RISCV_SUB_ULEB128` relocations. This can be
-achieved either by padding with zeroes to fill up to the XLEN-bits boundary
-or by filling the precomputed result into the relocation location.
+NOTE: The assembler must allocate sufficient space to accommodate the final
+value for the `R_RISCV_SET_ULEB128` and `R_RISCV_SUB_ULEB128` relocation pair
+and fill the space with a single ULEB128-encoded value.
+This is achieved by prepending the redundant `0x80` byte as necessary.
+The linker must not alter the length of the ULEB128-encoded value.
 
 ==== Calculation Symbols