Fix a typo

A typo fix.

Author: syncom

README.md

@@ -137,7 +137,7 @@ optional.
   external datum must be of the same type (file or directory) when instantiated.
   - "src" shall be a *relative path* to the project diectory where `r10edocker`
     is run
-  - "dest" shall be an *absolut path* in the final Docker container image
+  - "dest" shall be an *absolute path* in the final Docker container image
 - "include_ca_bundle" dictates a root CA bundle from the `cacert` package of
   nixpkgs will be installed in the container image. If the value of this field
   is set to `true` the root CA bundle will be included in the container, which