ccache: Updated caveat with better instructions

I also added a note about `ccache` never being
used by `brew` since that can be confusing.

Closes #20594.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/Library/Formula/ccache.rb b/Library/Formula/ccache.rb
index 2c9661930..b93441dc8 100644
--- a/Library/Formula/ccache.rb
+++ b/Library/Formula/ccache.rb
@@ -36,13 +36,14 @@ class Ccache < Formula
   def caveats; <<-EOS.undent
     To install symlinks for compilers that will automatically use
     ccache, prepend this directory to your PATH:
-      #{libexec}
+      #{opt_prefix}/libexec
 
     If this is an upgrade and you have previously added the symlinks to
-    your PATH, you will need to modify it to the path specified above so
-    it points to the new version.
+    your PATH, you may need to modify it to the path specified above so
+    it points to the current version.
 
     NOTE: ccache can prevent some software from compiling.
+    ALSO NOTE: The brew command, by design, will never use ccache.
     EOS
   end
 end