mail-client/alpine: Remove cross-references to removed packages

mail-client/alpine/metadata.xml

@@ -9,8 +9,7 @@
  <flag name="chappa">enhance alpine by applying Eduardo Chappa's
  patches</flag>
  <flag name="onlyalpine">installs only the alpine binary, so it does
- not collied with <pkg>app-editors/pico</pkg> and/or 
- <pkg>mail-client/pine</pkg></flag>
+ not collied with pico and/or pine</flag>
  <flag name="passfile">Adds support for caching passwords into a file
  between sessions</flag>
  <flag name="smime">Enable support for S/MIME</flag>