patch 8.2.1436: function implementing :substitute has unexpected name

Problem:    Function implementing :substitute has unexpected name.
Solution:   Rename from do_sub() to ex_substitute().
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 88161fa..2550f0e 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -3553,7 +3553,7 @@
  * The usual escapes are supported as described in the regexp docs.
  */
     void
-do_sub(exarg_T *eap)
+ex_substitute(exarg_T *eap)
 {
     linenr_T	lnum;
     long	i = 0;
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 508ecb8..b993ef2 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1270,7 +1270,7 @@
 EXCMD(CMD_rviminfo,	"rviminfo",	ex_viminfo,
 	EX_BANG|EX_FILE1|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
-EXCMD(CMD_substitute,	"substitute",	do_sub,
+EXCMD(CMD_substitute,	"substitute",	ex_substitute,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_LINES),
 EXCMD(CMD_sNext,	"sNext",	ex_previous,
@@ -1788,7 +1788,7 @@
 EXCMD(CMD_pound,	"#",		ex_print,
 	EX_RANGE|EX_WHOLEFOLD|EX_COUNT|EX_FLAGS|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_LINES),
-EXCMD(CMD_and,		"&",		do_sub,
+EXCMD(CMD_and,		"&",		ex_substitute,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_LOCK_OK|EX_MODIFY,
 	ADDR_LINES),
 EXCMD(CMD_star,		"*",		ex_at,
@@ -1806,7 +1806,7 @@
 EXCMD(CMD_at,		"@",		ex_at,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_LINES),
-EXCMD(CMD_tilde,	"~",		do_sub,
+EXCMD(CMD_tilde,	"~",		ex_substitute,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_CMDWIN|EX_LOCK_OK|EX_MODIFY,
 	ADDR_LINES),
 
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 502f33e..85d4df6 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -7343,7 +7343,7 @@
     int		magic_save = p_magic;
 
     p_magic = (eap->cmdidx == CMD_smagic);
-    do_sub(eap);
+    ex_substitute(eap);
     p_magic = magic_save;
 }
 
diff --git a/src/proto/ex_cmds.pro b/src/proto/ex_cmds.pro
index a9e0658..9036dd2 100644
--- a/src/proto/ex_cmds.pro
+++ b/src/proto/ex_cmds.pro
@@ -27,7 +27,7 @@
 void ex_z(exarg_T *eap);
 int check_restricted(void);
 int check_secure(void);
-void do_sub(exarg_T *eap);
+void ex_substitute(exarg_T *eap);
 int do_sub_msg(int count_only);
 void ex_global(exarg_T *eap);
 void global_exe(char_u *cmd);
diff --git a/src/version.c b/src/version.c
index f764e98..d4b0afa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1436,
+/**/
     1435,
 /**/
     1434,