Use @return $this where applicable (#1828)

src/Monolog/Handler/SlackHandler.php

@@ -192,6 +192,8 @@ class SlackHandler extends SocketHandler
 
     /**
      * Channel used by the bot when posting
+     *
+     * @return $this
      */
     public function setChannel(string $channel): self
     {
@@ -202,6 +204,8 @@ class SlackHandler extends SocketHandler
 
     /**
      * Username used by the bot when posting
+     *
+     * @return $this
      */
     public function setUsername(string $username): self
     {
@@ -210,6 +214,9 @@ class SlackHandler extends SocketHandler
         return $this;
     }
 
+    /**
+     * @return $this
+     */
     public function useAttachment(bool $useAttachment): self
     {
         $this->slackRecord->useAttachment($useAttachment);
@@ -217,6 +224,9 @@ class SlackHandler extends SocketHandler
         return $this;
     }
 
+    /**
+     * @return $this
+     */
     public function setIconEmoji(string $iconEmoji): self
     {
         $this->slackRecord->setUserIcon($iconEmoji);
@@ -224,6 +234,9 @@ class SlackHandler extends SocketHandler
         return $this;
     }
 
+    /**
+     * @return $this
+     */
     public function useShortAttachment(bool $useShortAttachment): self
     {
         $this->slackRecord->useShortAttachment($useShortAttachment);
@@ -231,6 +244,9 @@ class SlackHandler extends SocketHandler
         return $this;
     }
 
+    /**
+     * @return $this
+     */
     public function includeContextAndExtra(bool $includeContextAndExtra): self
     {
         $this->slackRecord->includeContextAndExtra($includeContextAndExtra);
@@ -240,6 +256,7 @@ class SlackHandler extends SocketHandler
 
     /**
      * @param string[] $excludeFields
+     * @return $this
      */
     public function excludeFields(array $excludeFields): self
     {