[task #16297] Add "How to read this manual" section in the book

[Pedram Ashofteh-Ardakani]

Follow-up Comment #2, task #16297 (project gnuastro):

Another note: most likely, we do not need to add unicode characters in the
'texi' file. They are not readable in the source code. But using the
programming glyphs will be readable. 

As a last resort, we can use the @math operator to create shapes we need
(which are also readable). For example, in the following screenshots, you can
see the pdf, info, and html output of the sample code below:


[...] TeXinfo initialization
Then use @command{make} with number of processors for faster execution:
@example
$ make -j8 # @math{\leftarrow} put number of processors here
@print{} EXAMPLE TEXT
@result{} EXAMPLE RESULT
@end example
@noindent
Or in short, just use:
@example
$ make -j$(nproc)
@end example
[...] The rest of the document


(file html.jpg)
(file info.jpg)
(file pdf.jpg)

(file #54155, file #54156, file #54157)

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Additional Item Attachment:

File name: html.jpg                       Size:9 KB
    <https://file.savannah.gnu.org/file/html.jpg?file_id=54155>

File name: info.jpg                       Size:20 KB
    <https://file.savannah.gnu.org/file/info.jpg?file_id=54156>

File name: pdf.jpg                        Size:16 KB
    <https://file.savannah.gnu.org/file/pdf.jpg?file_id=54157>



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