please make the commit log clean

[shynur .]

Hi, Chet.

I'm a beginner with Bash and recently stumbled upon the
Bash code repository (specifically the 'devel' branch).
I noticed that almost every commit includes thousands of
lines of changes.

Out of curiosity, I randomly clicked on one of the commits
(e.g., 
<https://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=772e7e760e8a098e4d8dee21cf11090be4757918>).
I found that the majority of the changes were to documentation,
such as the `doc/bash.0` file, which had 4999 lines modified.

While I'm not very familiar with the process of automatically
generating documentation, I can still infer that the `doc/bash.0`
file is an output produced by processing `doc/bash.info` with
some program.

I believe these output files should be added to `.gitignore`
and generated during the `make` process.  Otherwise, they will
severely pollute the commit history, making it much harder for
future maintainers to understand and manage the repository.

--
shynur