updated mechanisms to instruments (#1773)

_rules/auto-update-text-efbfc7.md

@@ -51,7 +51,7 @@ For each test target there is at least one set of [instruments][instrument], whe
 - The content being changed automatically is information. If the automatically changing content is not information (for example, an ASCII rendered spinning icon that does not provide information on what time is left for a process to end or how much progress has been made) the rule might fail but the success criterion might still be satisfied.
 - Any [content][] changes are enabled by the content of the [HTML document][] the test target belongs to. Changes originating from any other sources (e.g. browser shortcuts, browser extensions, browser settings, user agents, external browser applications) are not considered.
 - All user actions are transmitted by the user agent to the [HTML document][]. If there are other event sources that result from a user action this rule might fail but the success criterion might still be satisfied.
-- Available mechanisms for controlling the content changes rely on [activation][]. If there are other mechanisms that do not rely on [activation][] then the rule might fail but the success criterion might still be satisfied.
+- Available [instruments][instrument] for controlling the content changes rely on [activation][]. If there are other [instruments][instrument] that do not rely on [activation][] then the rule might fail but the success criterion might still be satisfied.
 - If there are other ways to control the automatically changing content that do not require the user to interact with the web page, failing this rule might not be a failure of the success criterion.
 - This rule does not check that the pausing instrument does not tie up the user focus. If that happens, then this rule might pass but the success criterion would not be satisfied.