Rollup merge of #63360 - brson:cz-help, r=Mark-Simulacrum

Use consistent capitalization in -C/-Z help

This code could also use a pass to consistify the grammar, but not by me atm.

src/librustc/session/config.rs

@@ -1155,7 +1155,7 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
     passes: Vec<String> = (Vec::new(), parse_list, [TRACKED],
         "a list of extra LLVM passes to run (space separated)"),
     llvm_args: Vec<String> = (Vec::new(), parse_list, [TRACKED],
-        "a list of arguments to pass to llvm (space separated)"),
+        "a list of arguments to pass to LLVM (space separated)"),
     save_temps: bool = (false, parse_bool, [UNTRACKED],
         "save all temporary output files during compilation"),
     rpath: bool = (false, parse_bool, [UNTRACKED],
@@ -1208,7 +1208,7 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
     default_linker_libraries: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
         "allow the linker to link its default libraries"),
     linker_flavor: Option<LinkerFlavor> = (None, parse_linker_flavor, [UNTRACKED],
-                                           "Linker flavor"),
+                                           "linker flavor"),
     linker_plugin_lto: LinkerPluginLto = (LinkerPluginLto::Disabled,
         parse_linker_plugin_lto, [TRACKED],
         "generate build artifacts that are compatible with linker-based LTO."),
@@ -1255,7 +1255,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     print_link_args: bool = (false, parse_bool, [UNTRACKED],
         "print the arguments passed to the linker"),
     print_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
-        "prints the llvm optimization passes being run"),
+        "prints the LLVM optimization passes being run"),
     ast_json: bool = (false, parse_bool, [UNTRACKED],
         "print the AST as JSON and halt"),
     threads: Option<usize> = (None, parse_opt_uint, [UNTRACKED],
@@ -1375,11 +1375,11 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],
         "pass `-install_name @rpath/...` to the macOS linker"),
     sanitizer: Option<Sanitizer> = (None, parse_sanitizer, [TRACKED],
-                                    "Use a sanitizer"),
+                                    "use a sanitizer"),
     fuel: Option<(String, u64)> = (None, parse_optimization_fuel, [TRACKED],
         "set the optimization fuel quota for a crate"),
     print_fuel: Option<String> = (None, parse_opt_string, [TRACKED],
-        "make Rustc print the total optimization fuel used by a crate"),
+        "make rustc print the total optimization fuel used by a crate"),
     force_unstable_if_unmarked: bool = (false, parse_bool, [TRACKED],
         "force all crates to be `rustc_private` unstable"),
     pre_link_arg: Vec<String> = (vec![], parse_string_push, [UNTRACKED],
@@ -1417,7 +1417,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "in dep-info output, omit targets for tracking dependencies of the dep-info files \
          themselves"),
     unpretty: Option<String> = (None, parse_unpretty, [UNTRACKED],
-        "Present the input source, unstable (and less-pretty) variants;
+        "present the input source, unstable (and less-pretty) variants;
         valid types are any of the types for `--pretty`, as well as:
         `expanded`, `expanded,identified`,
         `expanded,hygiene` (with internal representations),