docs: a couple of tweaks

docs/config/keys.markdown

@@ -642,6 +642,8 @@ triggered.
 
 ## Search
 
+*since: latest nightly*
+
 This action will trigger the search overlay for the current tab.
 It accepts a typed pattern string as its parameter, allowing for
 `Regex`, `CaseSensitiveString` and `CaseInSensitiveString` as
@@ -667,6 +669,8 @@ return {
 
 ## ActivateCopyMode
 
+*since: latest nightly*
+
 Activates copy mode!
 
 [Learn more about copy mode](../copymode.html)

docs/copymode.markdown

@@ -1,5 +1,7 @@
 ## Copy Mode
 
+*since: latest nightly*
+
 Copy mode allows you to make selections using the keyboard; no need to reach
 for your mouse or trackpad.
 
@@ -54,7 +56,7 @@ reassignable.
 | Move to top of viewport        | `H` |
 | Move to middle of viewport     | `M` |
 | Move to bottom of viewport     | `L` |
-| Move up one screen             | `PageUp  |
+| Move up one screen             | `PageUp` |
 |                                | `CTRL-b` |
 | Move down one screen           | `PageDown` |
 |                                | `CTRL-f`   |

docs/scrollback.markdown

@@ -84,6 +84,8 @@ When the search overlay is active the behavior of wezterm changes:
 
 ### Configuring Saved Searches
 
+*since: latest nightly*
+
 If you find that you're often searching for the same things then you may wish to assign
 a keybinding to trigger that search.