Switch \fish sections to rst format

sphinx_doc_src/cmds/block.rst

@@ -30,19 +30,22 @@ The following parameters are available:
 Example
 ------------
 
-\fish
-# Create a function that listens for events
-function --on-event foo foo; echo 'foo fired'; end
 
-# Block the delivery of events
-block -g
 
-emit foo
-# No output will be produced
+::
+
+    # Create a function that listens for events
+    function --on-event foo foo; echo 'foo fired'; end
+    
+    # Block the delivery of events
+    block -g
+    
+    emit foo
+    # No output will be produced
+    
+    block -e
+    # 'foo fired' will now be printed
 
-block -e
-# 'foo fired' will now be printed
-\endfish
 
 
 Notes