Fix some typos (#2880)

Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/gears/matcher.lua

@@ -512,7 +512,7 @@ function matcher:append_rules(source, rules)
     end
 end
 
---- Remove a new rule to the default set.
+--- Remove a new rule from the default set.
 -- @tparam string source The source name.
 -- @tparam string|table rule An existing rule or its `id`.
 -- @treturn boolean If the rule was removed.

lib/naughty/core.lua

@@ -139,7 +139,7 @@ gtable.crush(naughty, require("naughty.constants"))
 --
 -- When this is true, applications which query `naughty` feature support
 -- will see that animations are supported. Note that there is *very little*
--- support for this and enabled it will cause bugs.
+-- support for this and enabling it will cause bugs.
 --
 -- @property image_animations_enabled
 -- @param[opt=false] boolean

lib/naughty/notification.lua

@@ -419,7 +419,7 @@ local notification = {}
 --- The application name specified by the notification.
 --
 -- This can be anything. It is usually less relevant than the `clients`
--- property, but can sometime to specified for remote or headless notifications.
+-- property, but can sometime be specified for remote or headless notifications.
 -- In these case, it helps to triage and detect the notification from the rules.
 -- @property app_name
 -- @param string