clarified argument description

Author: nebulark

compiler/rustc_session/src/options.rs

@@ -1817,8 +1817,8 @@ options! {
         "emit noalias metadata for mutable references (default: yes)"),
     ms_hotpatch: bool = (false, parse_bool, [TRACKED],
         "ensures hotpatching is always possible by ensuring that the first instruction of \
-        each function is at least two bytes, and no jump within the function goes to the first instruction \
-        and adding enough padding to the beginning of each function. Only relevant for x86 with MSVC (default: false)"),
+        each function is at least two bytes, and no jump within the function goes to the first instruction. \
+        Should be combined with link-arg passing -functionpadmin to the linker. Currently only supported for x86 (default: false)"),
     next_solver: Option<NextSolverConfig> = (None, parse_next_solver_config, [TRACKED],
         "enable and configure the next generation trait solver used by rustc"),
     nll_facts: bool = (false, parse_bool, [UNTRACKED],