Document Action Chain Delay in library introduction

src/SeleniumLibrary/__init__.py

@@ -491,6 +491,19 @@ class SeleniumLibrary(DynamicCore):
 
     See `time format` below for supported syntax.
 
+    == Action chain delay ==
+
+    Actions that are built using Selenium's ActionChains, such as mouse
+    movements used by the drag and drop keywords, use a small delay when
+    moving the pointer. The default delay is 250 milliseconds, but it can be
+    changed with the `Set Action Chain Delay` keyword or with the
+    ``action_chain_delay`` argument when `importing` the library. The current
+    value can be read with the `Get Action Chain Delay` keyword.
+
+    See `time format` below for supported syntax.
+
+    Support for action chain delay is new in SeleniumLibrary 6.1
+
     == Time format ==
 
     All timeouts and waits can be given as numbers considered seconds

utest/test/api/approved_files/PluginDocumentation.test_many_plugins.approved.txt

@@ -429,6 +429,19 @@ and waits should be used instead.
 
 See `time format` below for supported syntax.
 
+== Action chain delay ==
+
+Actions that are built using Selenium's ActionChains, such as mouse
+movements used by the drag and drop keywords, use a small delay when
+moving the pointer. The default delay is 250 milliseconds, but it can be
+changed with the `Set Action Chain Delay` keyword or with the
+``action_chain_delay`` argument when `importing` the library. The current
+value can be read with the `Get Action Chain Delay` keyword.
+
+See `time format` below for supported syntax.
+
+Support for action chain delay is new in SeleniumLibrary 6.1
+
 == Time format ==
 
 All timeouts and waits can be given as numbers considered seconds