containers.conf.5.md: simplify wording to avoit tautology

Insisting on “DCO” imposes formalities, that serve self-purpose.  One cannot
assume that the submitter has time or will to read texts about symbolism in
software contributions.  If the system wants to see the text

  nrEAUIEUAIe eanuitdnuae EAIUEAUIAIE »ℓ§444.3.72b)°»°ℓ§euaieauuae

in each commit, people will write this, or any other text, that the system wants to
see.  All such text, which presence is mandated by the system, has the same value.

Signed-off-by: Дилян Палаузов <git-dpa@aegee.org>

docs/containers.conf.5.md

@@ -47,8 +47,7 @@ TOML can be simplified to:
     option = value
 
 ## CONTAINERS TABLE
-The containers table contains settings pertaining to the OCI runtime that can
-configure and manage the OCI runtime.
+The containers table contains settings to configure and manage the OCI runtime.
 
 **annotations** = []
 List of annotations. Specified as "key=value" pairs to be added to all containers.