DOC: improve doc warnings

Documentation/Cookbook/Scripts/otb_warnings.py

 import sys
+import re
 
 def parameter_warnings(app_warn, app, key):
 
@@ -17,11 +18,13 @@ def parameter_warnings(app_warn, app, key):
     if "." in name:
         warn("name contains a special character (.)")
 
+    # disabled because there are so many for now
     #if description == "":
         #warn("missing description")
 
-    if len(description) > 0 and description[-1] != ".":
-        warn("description does not end with a period")
+    # disabled because there are so many for now
+    #if len(description) > 0 and description[-1] != ".":
+        #warn("description does not end with a period")
 
     if len(description) > 0 and " :" in description:
         warn("description has a space before a colon")
@@ -38,7 +41,7 @@ def application_documentation_warnings(app):
     if not longdescription[-1] == ".":
         warn("Application Long Description does not end with a period (.)")
 
-    if "\n " in longdescription:
+    if re.search("\\n [a-zA-Z]", longdescription):
         warn("Application Long Description contains '\\n ' pattern (usually not intended)")
 
     if " :" in longdescription: