Update runtime files.
diff --git a/runtime/doc/develop.txt b/runtime/doc/develop.txt
index f139ebe..e48983b 100644
--- a/runtime/doc/develop.txt
+++ b/runtime/doc/develop.txt
@@ -1,4 +1,4 @@
-*develop.txt* For Vim version 8.2. Last change: 2020 Jul 27
+*develop.txt* For Vim version 8.2. Last change: 2020 Aug 15
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -473,7 +473,7 @@
was that none of them provided sufficient capabilities to be used as the spell
checking engine in Vim, for various reasons:
-- Missing support for multi-byte encodings. At least UTF-8 must be supported,
+- Missing support for multibyte encodings. At least UTF-8 must be supported,
so that more than one language can be used in the same file.
Doing on-the-fly conversion is not always possible (would require iconv
support).