Base: Change gist of Shell man page

Pre-patch, the man page encased the name of the program in quotes,
which is inconsistent with other man pages, unnecessarily
repeated "Shell" in the gist, and included "the" in the gist,
which is also inconsistent with other man pages.

Base/usr/share/man/man1/Shell.md

@@ -1,6 +1,6 @@
 ## Name
 
-`Shell` - Shell, the command language interpreter
+Shell - command language interpreter
 
 ## Synopsis