patch 8.2.0932: missspelling spelllang

Problem:    Missspelling spelllang.
Solution:   Add an "l". (Dominique Pelle)
diff --git a/src/proto/spell.pro b/src/proto/spell.pro
index 461b5e1..6b1f84b 100644
--- a/src/proto/spell.pro
+++ b/src/proto/spell.pro
@@ -43,7 +43,7 @@
 int spell_word_start(int startcol);
 void spell_expand_check_cap(colnr_T col);
 int expand_spelling(linenr_T lnum, char_u *pat, char_u ***matchp);
-int valid_spellang(char_u *val);
+int valid_spelllang(char_u *val);
 int valid_spellfile(char_u *val);
 char *did_set_spell_option(int is_spellfile);
 char *compile_cap_prog(synblock_T *synblock);