bitbake: sphinx: bitbake-user-manual: insert additional blank line after title

(Bitbake rev: 4f94633a68fd44223d6be458fc0d3616dfdfd1a7)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.rst

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 Execution
 =========
 
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+
 The primary purpose for running BitBake is to produce some kind of
 output such as a single installable package, a kernel, a software
 development kit, or even a full, board-specific bootable Linux image,

bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst

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 File Download Support
 =====================
 
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+
 BitBake's fetch module is a standalone piece of library code that deals
 with the intricacies of downloading source code and files from remote
 systems. Fetching source code is one of the cornerstones of building

bitbake/doc/bitbake-user-manual/bitbake-user-manual-intro.rst

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 Overview
 ========
 
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+
 Welcome to the BitBake User Manual. This manual provides information on
 the BitBake tool. The information attempts to be as independent as
 possible regarding systems that use BitBake, such as OpenEmbedded and

bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst

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 Syntax and Operators
 ====================
 
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+
 BitBake files have their own syntax. The syntax has similarities to
 several other languages but also has some unique features. This section
 describes the available syntax and operators as well as provides

bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst

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 Variables Glossary
 ==================
 
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 This chapter lists common variables used by BitBake and gives an
 overview of their function and contents.