Merge pull request #1008 from sharelatex/ta-fix-help-link

fix link to link sharing help page

services/web/app/views/project/editor/share.pug

@@ -19,7 +19,7 @@ script(type='text/ng-template', id='shareProjectModalTemplate')
 					) #{translate('turn_on_link_sharing')}
 					span   
 					a(
-						href="/learn/Kb/what_is_link_sharing"
+						href="/learn/how-to/What_is_Link_Sharing%3F"
 						target="_blank"
 					)
 						i.fa.fa-question-circle(
@@ -38,7 +38,7 @@ script(type='text/ng-template', id='shareProjectModalTemplate')
 					) #{translate('turn_off_link_sharing')}
 					span   
 					a(
-						href="/learn/Kb/what_is_link_sharing"
+						href="/learn/how-to/What_is_Link_Sharing%3F"
 						target="_blank"
 					)
 						i.fa.fa-question-circle(