Update api.md

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@@ -347,7 +347,7 @@ Friendica doesn't allow showing followers of other users.
 Friendica doesn't allow showing friends of other users.\r
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-## Implemented API calls (not compatible with other API’s)\r
+## Implemented API calls (not compatible with other APIs)\r
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 ### friendica/group_show\r
 Return all or a specified group of the user with the containing contacts as array.\r