patch 8.2.1635: no digraph for 0x2022 BULLET

Problem:    No digraph for 0x2022 BULLET.
Solution:   Use "oo". (Hans Ginzel, closes #6904)

runtime/doc/digraph.txt

@@ -921,6 +921,7 @@ char  digraph	hex	dec	official name ~
 ‟	9"	201F	8223	DOUBLE HIGH-REVERSED-9 QUOTATION MARK
 †	/-	2020	8224	DAGGER
 ‡	/=	2021	8225	DOUBLE DAGGER
+•	oo	2022	8226	BULLET
 ‥	..	2025	8229	TWO DOT LEADER
 …	,.	2026	8230	HORIZONTAL ELLIPSIS
 ‰	%0	2030	8240	PER MILLE SIGN

src/digraph.c

@@ -1173,6 +1173,7 @@ static digr_T digraphdefault[] =
 	{'9', '"', 0x201f},
 	{'/', '-', 0x2020},
 	{'/', '=', 0x2021},
+	{'o', 'o', 0x2022},
 	{'.', '.', 0x2025},
 	{',', '.', 0x2026},
 	{'%', '0', 0x2030},

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1635,
 /**/
     1634,
 /**/