Make some option descriptions fit the usual pattern.

- No trailing '.' chars.
- Use a lower-case letter at the start.

Author: nnethercote

src/librustc_session/options.rs

@@ -721,7 +721,7 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
                                            "linker flavor"),
     linker_plugin_lto: LinkerPluginLto = (LinkerPluginLto::Disabled,
         parse_linker_plugin_lto, [TRACKED],
-        "generate build artifacts that are compatible with linker-based LTO."),
+        "generate build artifacts that are compatible with linker-based LTO"),
     profile_generate: SwitchWithOptPath = (SwitchWithOptPath::Disabled,
         parse_switch_with_opt_path, [TRACKED],
         "compile the program with profiling instrumentation"),
@@ -875,9 +875,9 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     sanitizer: Option<Sanitizer> = (None, parse_sanitizer, [TRACKED],
                                     "use a sanitizer"),
     sanitizer_recover: Vec<Sanitizer> = (vec![], parse_sanitizer_list, [TRACKED],
-        "Enable recovery for selected sanitizers"),
+        "enable recovery for selected sanitizers"),
     sanitizer_memory_track_origins: usize = (0, parse_sanitizer_memory_track_origins, [TRACKED],
-        "Enable origins tracking in MemorySanitizer"),
+        "enable origins tracking in MemorySanitizer"),
     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],
@@ -897,7 +897,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     nll_facts: bool = (false, parse_bool, [UNTRACKED],
                        "dump facts from NLL analysis into side files"),
     dont_buffer_diagnostics: bool = (false, parse_bool, [UNTRACKED],
-        "emit diagnostics rather than buffering (breaks NLL error downgrading, sorting)."),
+        "emit diagnostics rather than buffering (breaks NLL error downgrading, sorting)"),
     polonius: bool = (false, parse_bool, [UNTRACKED],
         "enable polonius-based borrow-checker"),
     thinlto: Option<bool> = (None, parse_opt_bool, [TRACKED],
@@ -931,7 +931,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     embed_bitcode: bool = (false, parse_bool, [TRACKED],
         "embed LLVM bitcode in object files"),
     strip_debuginfo_if_disabled: Option<bool> = (None, parse_opt_bool, [TRACKED],
-        "tell the linker to strip debuginfo when building without debuginfo enabled."),
+        "tell the linker to strip debuginfo when building without debuginfo enabled"),
     share_generics: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "make the current crate share its generic instantiations"),
     no_parallel_llvm: bool = (false, parse_bool, [UNTRACKED],
@@ -981,7 +981,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     new_llvm_pass_manager: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "use new LLVM pass manager"),
     link_native_libraries: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
-        "Link native libraries in the linker invocation."),
+        "link native libraries in the linker invocation"),
     src_hash_algorithm: Option<SourceFileHashAlgorithm> = (None, parse_src_file_hash, [TRACKED],
         "hash algorithm of source files in debug info (`md5`, or `sha1`)"),
 }