docs: fix typos (#21961)

Co-authored-by: Ben Morgan <cassava@iexu.de>

runtime/doc/eval.txt

@@ -1827,8 +1827,8 @@ v:event		Dictionary of event data for the current |autocommand|.  Valid
 					|CompleteChanged|.
 			scrollbar 	Is |v:true| if popup menu have scrollbar, or
 					|v:false| if not.
-			changed_window 	Is |v:true| if the the event fired
-					while changing window (or tab) on |DirChanged|.
+			changed_window 	Is |v:true| if the event fired while
+					changing window (or tab) on |DirChanged|.
 			status		Job status or exit code, -1 means "unknown". |TermClose|
 
 					*v:exception* *exception-variable*

runtime/doc/intro.txt

@@ -382,7 +382,7 @@ Note:
 - If numlock is on the |TUI| receives plain ASCII values, so mapping <k0>,
   <k1>, ..., <k9> and <kPoint> will not work.
 - Nvim supports mapping multibyte chars with modifiers such as `<M-ä>`. Which
-  combinations actually work depends on the the UI or host terminal.
+  combinations actually work depends on the UI or host terminal.
 - When a key is pressed using a meta or alt modifier and no mapping exists for
   that keypress, Nvim may behave as though <Esc> was pressed before the key.
 - It is possible to notate combined modifiers (e.g. <C-A-T> for CTRL-ALT-T),

runtime/doc/tagsrch.txt

@@ -92,7 +92,7 @@ The ignore-case matches are found when:
 - when 'tagcase' is "followscs" and 'ignorecase' is on or the 'smartcase'
   option is on and the pattern does not contain an upper case character
 - when 'tagcase' is "ignore"
-- when 'tagcase' is "smart" and the patter does not contain an upper case
+- when 'tagcase' is "smart" and the pattern does not contain an upper case
   character
 
 Note that using ignore-case tag searching disables binary searching in the