Update runtime files
diff --git a/runtime/doc/digraph.txt b/runtime/doc/digraph.txt
index 918bdd8..e9bdeb5 100644
--- a/runtime/doc/digraph.txt
+++ b/runtime/doc/digraph.txt
@@ -1,4 +1,4 @@
-*digraph.txt* For Vim version 9.0. Last change: 2022 Nov 22
+*digraph.txt* For Vim version 9.0. Last change: 2023 Mar 21
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -547,7 +547,7 @@
Θ H* 0398 0920 GREEK CAPITAL LETTER THETA
Ι I* 0399 0921 GREEK CAPITAL LETTER IOTA
Κ K* 039A 0922 GREEK CAPITAL LETTER KAPPA
-Λ L* 039B 0923 GREEK CAPITAL LETTER LAMDA
+Λ L* 039B 0923 GREEK CAPITAL LETTER LAMDA (aka LAMBDA)
Μ M* 039C 0924 GREEK CAPITAL LETTER MU
Ν N* 039D 0925 GREEK CAPITAL LETTER NU
Ξ C* 039E 0926 GREEK CAPITAL LETTER XI
@@ -578,7 +578,7 @@
θ h* 03B8 0952 GREEK SMALL LETTER THETA
ι i* 03B9 0953 GREEK SMALL LETTER IOTA
κ k* 03BA 0954 GREEK SMALL LETTER KAPPA
-λ l* 03BB 0955 GREEK SMALL LETTER LAMDA
+λ l* 03BB 0955 GREEK SMALL LETTER LAMDA (aka LAMBDA)
μ m* 03BC 0956 GREEK SMALL LETTER MU
ν n* 03BD 0957 GREEK SMALL LETTER NU
ξ c* 03BE 0958 GREEK SMALL LETTER XI