[RISCV] Update descriptions for Zvk* shorthands. (#77961)

This makes them more consistent with other extensions so they appear
move similar in the -print-supported-extensions output.

Author: topperc

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -637,40 +637,36 @@ def FeatureStdExtZvkt
 
 def FeatureStdExtZvkn
     : SubtargetFeature<"zvkn", "HasStdExtZvkn", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvkned, Zvknhb, Zvkb and Zvkt.",
+                       "'Zvkn' (shorthand for 'Zvkned', 'Zvknhb', 'Zvkb', and "
+                       "'Zvkt')",
                        [FeatureStdExtZvkned, FeatureStdExtZvknhb,
                         FeatureStdExtZvkb, FeatureStdExtZvkt]>;
 
 def FeatureStdExtZvknc
     : SubtargetFeature<"zvknc", "HasStdExtZvknc", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvkn and Zvbc.",
+                       "'Zvknc' (shorthand for 'Zvknc' and 'Zvbc')",
                        [FeatureStdExtZvkn, FeatureStdExtZvbc]>;
 
 def FeatureStdExtZvkng
     : SubtargetFeature<"zvkng", "HasStdExtZvkng", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvkn and Zvkg.",
+                       "'zvkng' (shorthand for 'Zvkn' and 'Zvkg')",
                        [FeatureStdExtZvkn, FeatureStdExtZvkg]>;
 
 def FeatureStdExtZvks
     : SubtargetFeature<"zvks", "HasStdExtZvks", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvksed, Zvksh, Zvkb and Zvkt.",
+                       "'Zvks' (shorthand for 'Zvksed', 'Zvksh', 'Zvkb', and "
+                       "'Zvkt')",
                        [FeatureStdExtZvksed, FeatureStdExtZvksh,
                         FeatureStdExtZvkb, FeatureStdExtZvkt]>;
 
 def FeatureStdExtZvksc
     : SubtargetFeature<"zvksc", "HasStdExtZvksc", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvks and Zvbc.",
+                       "'Zvksc' (shorthand for 'Zvks' and 'Zvbc')",
                        [FeatureStdExtZvks, FeatureStdExtZvbc]>;
 
 def FeatureStdExtZvksg
     : SubtargetFeature<"zvksg", "HasStdExtZvksg", "true",
-                       "This extension is shorthand for the following set of "
-                       "other extensions: Zvks and Zvkg.",
+                       "'Zvksg' (shorthand for 'Zvks' and 'Zvkg')",
                        [FeatureStdExtZvks, FeatureStdExtZvkg]>;
 
 def FeatureStdExtZicfilp