8.10.4 Release notes (#4024)

(cherry picked from commit ed89c0e)

docs/release-notes.asciidoc

@@ -3,6 +3,7 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-8.10.4, {elastic-sec} version 8.10.4>>
 * <<release-notes-8.10.3, {elastic-sec} version 8.10.3>>
 * <<release-notes-8.10.2, {elastic-sec} version 8.10.2>>
 * <<release-notes-8.10.1, {elastic-sec} version 8.10.1>>

docs/release-notes/8.10.asciidoc

@@ -1,6 +1,16 @@
 [[release-notes-header-8.10.1]]
 == 8.10
 
+[discrete]
+[[release-notes-8.10.4]]
+=== 8.10.4
+
+[discrete]
+[[bug-fixes-8.10.4]]
+==== Bug fixes
+* Fixes a bug in Timeline that prevented the **Show top _x_** action from showing results ({pull}168339[#168339]).
+* Fixes a bug that caused outdated or incorrect data to display on the MITRE ATT&CK® Coverage page ({pull}167917[#167917]). 
+
 [discrete]
 [[release-notes-8.10.3]]
 === 8.10.3
@@ -17,7 +27,7 @@
 * Adds tooltips to the Correlations table in the alert details flyout ({pull}166913[#166913]).
 * Fixes a bug that prevented the prevalence query from considering fields with multiple values ({pull}166891[#166891]).
 * Fixes an alert details flyout bug that affected the way prevalence data was fetched ({pull}166694[#166694]).
-* Fixes issues with the **Top alerts by** inline action within Timeline ({pull}165109[#165109]).
+* Fixes a bug in Timeline that prevented the **Show top _x_** action from using the Timeline query ({pull}165109[#165109]).
 
 [discrete]
 [[release-notes-8.10.2]]