dpkg-architecture: Say arch-wildcard instead of arch-alias in --help output

The latter is an old name for the architecture wildcards.

debian/changelog

@@ -100,6 +100,7 @@ dpkg (1.17.14) UNRELEASED; urgency=low
     to select specific subsets of all valid known architectures, matching by
     wildcard (-W), endianness (-E) or bits (-B). The restricting options can
     be combined, or omitted altogether. Closes: #762635
+  * Say arch-wildcard instead of arch-alias in dpkg-architecture --help output.
 
   [ Raphaël Hertzog ]
   * Explain better in deb-triggers(5) why interest/activate-noawait should be

scripts/dpkg-architecture.pl

@@ -50,7 +50,7 @@ sub usage {
   -l                 list variables (default).
   -L                 list valid architectures (matching some criteria).
   -e<debian-arch>    compare with host Debian architecture.
-  -i<arch-alias>     check if host Debian architecture is <arch-alias>.
+  -i<arch-wildcard>  check if host Debian architecture is <arch-wildcard>.
   -q<variable>       prints only the value of <variable>.
   -s                 print command to set environment variables.
   -u                 print command to unset environment variables.