[llvm-objcopy] Adjust the help message

[alexander-shaposhnikov]

Summary

Capitalize the first letter + make the text a bit more consistent.
NFC.

[jakehehrlich]

LGTM

tools/llvm-objcopy/Opts.td

defm output_target : Eq<"output-target">,
                      Values<"binary">;
 def O : JoinedOrSeparate<["-"], "O">,
         Alias<output_target>;
 defm split_dwo : Eq<"split-dwo">,
                  MetaVarName<"dwo-file">,
                  HelpText<"Equivalent to extract-dwo on the input file to <dwo-file>, then strip-dwo on the input file">;
 defm add_gnu_debuglink : Eq<"add-gnu-debuglink">,
                          MetaVarName<"debug-file">,
-                         HelpText<"adds a .gnu_debuglink for <debug-file>">;
+                         HelpText<"Add a .gnu_debuglink for <debug-file>">;
 defm remove_section : Eq<"remove-section">,
                       MetaVarName<"section">,
                       HelpText<"Remove <section>">;
 def R : JoinedOrSeparate<["-"], "R">,
         Alias<remove_section>;
 defm keep : Eq<"keep">,
             MetaVarName<"section">,
             HelpText<"Keep <section>">;
 defm only_keep : Eq<"only-keep">,
                  MetaVarName<"section">,
                  HelpText<"Remove all but <section>">;
 def j : JoinedOrSeparate<["-"], "j">,
                       Alias<only_keep>;
 defm add_section : Eq<"add-section">,
                    MetaVarName<"section=file">,
                    HelpText<"Make a section named <section> with the contents of <file>.">;
 def strip_all : Flag<["-", "--"], "strip-all">,
-                HelpText<"Removes non-allocated sections other than .gnu.warning* sections">;
+                HelpText<"Remove non-allocated sections other than .gnu.warning* sections">;
 def strip_all_gnu : Flag<["-", "--"], "strip-all-gnu">,
                     HelpText<"Compaitable with GNU objcopy's --strip-all">;
 def strip_debug : Flag<["-", "--"], "strip-debug">,
-                  HelpText<"Removes all debug information">;
+                  HelpText<"Remove all debug information">;
 def strip_dwo : Flag<["-", "--"], "strip-dwo">,
                 HelpText<"Remove all DWARF .dwo sections from file">;
 def strip_sections : Flag<["-", "--"], "strip-sections">,
                      HelpText<"Remove all section headers">;
 def strip_non_alloc : Flag<["-", "--"], "strip-non-alloc">,
                       HelpText<"Remove all non-allocated sections">;
 def extract_dwo : Flag<["-", "--"], "extract-dwo">,
                   HelpText<"Remove all sections that are not DWARF .dwo sections from file">;
 def localize_hidden : Flag<["-", "--"], "localize-hidden">,
                       HelpText<"Mark all symbols that have hidden or internal visibility as local">;