[llvm-symbolizer][doc] Reorder --relativenames in options list

This puts it in alphabetical order, matching the rest of the list.

Reviewed by: MaskRay, saugustine

Differential Revision: https://reviews.llvm.org/D94481

Author: jh7370

llvm/docs/CommandGuide/llvm-symbolizer.rst

@@ -182,12 +182,6 @@ OPTIONS
 
   Print just the file's name without any directories, instead of the
   absolute path.
-
-.. option:: --relativenames
-
-  Print the file's path relative to the compilation directory, instead
-  of the absolute path. If the command-line to the compiler included
-  the full path, this will be the same as the default.
 
 .. _llvm-symbolizer-opt-C:
 
@@ -321,6 +315,12 @@ OPTIONS
     11 >:   return foz() + k;
     12  : }
 
+.. option:: --relativenames
+
+  Print the file's path relative to the compilation directory, instead
+  of the absolute path. If the command-line to the compiler included
+  the full path, this will be the same as the default.
+
 .. _llvm-symbolizer-opt-use-symbol-table:
 
 .. option:: --use-symbol-table