Revert "docs(env-file): improve document description"

This reverts commit c67ef7c.

see containers#19565

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

docs/source/markdown/options/env-file.md

@@ -4,8 +4,4 @@
 ####> are applicable to all of those.
 #### **--env-file**=*file*
 
-Read the environment variables from the file, supporting prefix matching: `KEY*`, as well as multiline values in double quotes and single quotes, but not multiline values in backticks.
-The env-file will ignore comments and empty lines. And spaces or tabs before and after the KEY.
-If an invalid value is encountered, such as only an `=` sign, it will be skipped. If it is a prefix match (`KEY*`), all environment variables starting with KEY on the host machine will be loaded.
-If it is only KEY (`KEY`), the KEY environment variable on the host machine will be loaded.
-Compatible with the `export` syntax in **dotenv**, such as: `export KEY=bar`.
+Read in a line-delimited file of environment variables.