[llvm] [llvm-objcopy] Improve help messages (PR #82830)

[Ilia Kuklin via llvm-commits]

================
@@ -148,48 +146,49 @@ defm globalize_symbol : Eq<"globalize-symbol", "Mark <symbol> as global">,
 
 defm globalize_symbols
     : Eq<"globalize-symbols",
-         "Reads a list of symbols from <filename> and marks them global">,
+         "Read a list of symbols from <filename> and mark defined symbols"
+         " with those names as global">,
       MetaVarName<"filename">;
 
 defm keep_global_symbol
     : Eq<"keep-global-symbol",
-         "Convert all symbols except <symbol> to local. May be repeated to "
-         "convert all except a set of symbols to local">,
+         "Mark all symbols local, except for symbols with the name <symbol>. "
+         "Can be specified multiple times to ignore multiple symbols">,
       MetaVarName<"symbol">;
 def G : JoinedOrSeparate<["-"], "G">,
         Alias<keep_global_symbol>,
         HelpText<"Alias for --keep-global-symbol">;
 
 defm keep_global_symbols
     : Eq<"keep-global-symbols",
-         "Reads a list of symbols from <filename> and runs as if "
+         "Read a list of symbols from <filename> and run as if "
          "--keep-global-symbol=<symbol> is set for each one. <filename> "
          "contains one symbol per line and may contain comments beginning with "
          "'#'. Leading and trailing whitespace is stripped from each line. May "
          "be repeated to read symbols from many files">,
       MetaVarName<"filename">;
 
-defm weaken_symbol : Eq<"weaken-symbol", "Mark <symbol> as weak">,
+defm weaken_symbol : Eq<"weaken-symbol", "Mark global symbols named <symbol> as weak">,
                      MetaVarName<"symbol">;
 defm weaken_symbols
     : Eq<"weaken-symbols",
-         "Reads a list of symbols from <filename> and marks them weak">,
+         "Read a list of symbols from <filename> and mark global symbols with those names as weak">,
       MetaVarName<"filename">;
 
 def W : JoinedOrSeparate<["-"], "W">,
         Alias<weaken_symbol>,
         HelpText<"Alias for --weaken-symbol">;
 def weaken : Flag<["--"], "weaken">,
-             HelpText<"Mark all global symbols as weak">;
+             HelpText<"Mark all defined global symbols as weak">;
 
 defm strip_symbols
     : Eq<"strip-symbols",
-         "Reads a list of symbols from <filename> and removes them">,
+         "Remove all symbols whose names appear in the file <filename>">,
       MetaVarName<"filename">;
 
 defm keep_symbols
     : Eq<"keep-symbols",
-         "Reads a list of symbols from <filename> and runs as if "
+         "Read a list of symbols from <filename> and runs as if "
----------------
kuilpd wrote:

```suggestion
         "Read a list of symbols from <filename> and run as if "
```

https://github.com/llvm/llvm-project/pull/82830