patch 9.0.0828: various typos

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)
diff --git a/src/proto/usercmd.pro b/src/proto/usercmd.pro
index 47ef6f0..d0cd2a3 100644
--- a/src/proto/usercmd.pro
+++ b/src/proto/usercmd.pro
@@ -18,7 +18,7 @@
 void ex_comclear(exarg_T *eap);
 void uc_clear(garray_T *gap);
 void ex_delcommand(exarg_T *eap);
-size_t add_win_cmd_modifers(char_u *buf, cmdmod_T *cmod, int *multi_mods);
+size_t add_win_cmd_modifiers(char_u *buf, cmdmod_T *cmod, int *multi_mods);
 size_t produce_cmdmods(char_u *buf, cmdmod_T *cmod, int quote);
 void do_ucmd(exarg_T *eap);
 /* vim: set ft=c : */
diff --git a/src/proto/vim9execute.pro b/src/proto/vim9execute.pro
index f8e8106..81f762e 100644
--- a/src/proto/vim9execute.pro
+++ b/src/proto/vim9execute.pro
@@ -4,7 +4,7 @@
 int funcstack_check_refcount(funcstack_T *funcstack);
 int set_ref_in_funcstacks(int copyID);
 int in_def_function(void);
-ectx_T *clear_currrent_ectx(void);
+ectx_T *clear_current_ectx(void);
 void restore_current_ectx(ectx_T *ectx);
 int add_defer_function(char_u *name, int argcount, typval_T *argvars);
 char_u *char_from_string(char_u *str, varnumber_T index);