man/make.conf.5: fix substitution spelling
diff --git a/man/make.conf.5 b/man/make.conf.5
index 57d0523..63e2097 100644
--- a/man/make.conf.5
+++ b/man/make.conf.5
@@ -9,7 +9,7 @@
newline\-delimited list of \fI<key>=<value>\fR pairs (see the default file for
examples) which are accessible from the environment of ebuilds. It supports
simple shell\-like expansion of the form \fIvar="${var}"\fR, the source
-keyword and variable substituton, but not some of the more advanced BASH
+keyword and variable substitution, but not some of the more advanced BASH
features like arrays and special parameter expansions. For more details, see
the Simple lexical analysis documentation:
\fLhttp://docs.python.org/3/library/shlex.html\fR.
