Tweak newly added rustc completion descriptions

Addendum to #10491

share/completions/rustc.fish

@@ -6,14 +6,14 @@ complete -c rustc -r -s L -a 'dependency= crate= native= framework= all='
 complete -c rustc -x -s l -a 'dylib= static= framework='
 complete -c rustc -x -l crate-type -a 'bin lib rlib dylib cdylib staticlib proc-macro'
 complete -c rustc -r -l crate-name
-complete -c rustc -x -l edition -a '2015 2018 2021' -d "Specify which edition of the compiler to use"
+complete -c rustc -x -l edition -a '2015 2018 2021' -d "Specify compiler edition"
 complete -c rustc -x -l emit -a 'asm llvm-bc llvm-ir obj link dep-info metadata mir'
 set -l rustc_print_infos \
     crate-name file-names sysroot target-libdir cfg calling-conventions \
     target-list target-cpus target-features relocation-models code-models \
     tls-models target-spec-json all-target-specs-json native-static-libs \
     stack-protector-strategies link-args deployment-target
-complete -c rustc -x -l print -a "$rustc_print_infos" -d "print compiler information"
+complete -c rustc -x -l print -a "$rustc_print_infos" -d "Print compiler information"
 complete -c rustc -s g -d "Equivalent to -C debuginfo=2"
 complete -c rustc -s O -d "Equivalent to -C opt-level=2"
 complete -c rustc -r -s o -d "Write output to <filename>"