user-manual: Standardize backtick quoting

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 330b036ac931198aa1b6e93c3602d2a2cd38291c..e338be5e57e32f52cfa818fd44a6364c00c24cdd 100644 (file)
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 # git-mergetool--lib is a library for common merge tool functions
-MERGE_TOOLS_DIR=$(git --exec-path)/mergetools
+
+: ${MERGE_TOOLS_DIR=$(git --exec-path)/mergetools}
 
 mode_ok () {
        if diff_mode