Add "a condition met when the symbol is sufficiently aligned."

Author: MaskRay

riscv-elf.adoc

@@ -584,7 +584,7 @@ The following assembly and relocations show loading an absolute address:
 A symbol can be loaded in multiple fragments using different addends, where
 multiple instructions associated with `R_RISCV_LO12_I`/`R_RISCV_LO12_S` share a
 single `R_RISCV_HI20`. The HI20 values for the multiple fragments must be
-identical.
+identical, a condition met when the symbol is sufficiently aligned.
 
 [,asm]
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