Minor corrections for boost.program_options documentation

[pfee@…]

Reading the library documentation I noted a few issues.

http://www.boost.org/doc/libs/1_54_0/doc/html/program_options/overview.html

Section "Syntactic Information"

Following the code snippet, the text describes four parameters. However the second option ("compression") is described as "the first option".

Fixed text: "For the second option, the user must specify a value, using a single token."

Section: Description formatting

Current text: "compute the indentation for options's description" Fixed text: "compute the indentation for option's description"

Current text: "Each of the paragraph is output" Fixed text: "Each of the paragraphs are output" or "Each paragraph is output"

Current text: "Only one tabulator per paragraph is allowed, otherwisee an exception" Fixed text: "Only one tabulator per paragraph is allowed, otherwise an exception"