Why is there a period after the block title in the PDF output?

We can configure the way the caption is presented in latex with the package caption. The period is configured with the option textformat:

With the option

textformat=<<text format name>>

you specify how the caption text will be typeset. There are two standard caption text formats:

empty	The caption text will be suppressed.
simple	The caption text will be typeset as it is.
period	The caption text will be followed by a period.

To configure a caption without a period at the end, you should configure your latex file with:

\usepackage[textformat=simple]{caption}