url.md: clarify

- the specified URL can also get data sent to it
- rephrase the scheme guessing part
- mention target options for each URL for saving data
- mention --remote-name

url.md: clarify

- the specified URL can also get data sent to it
- rephrase the scheme guessing part
- mention target options for each URL for saving data
- mention --remote-name-all
- remove "warning" and make it into normal text

Closes #15396

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GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.p

GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.proselintrc was found instead of a JSON file. Rename to /home/runner/.proselintrc.json.
```
- fix an input filename.
`proselints` fails now if an input file is missing.

Reported-by: Jay Satiro
Bug: https://github.com/curl/curl/pull/15291#issuecomment-2410505100
Closes #15293

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managen: "added in" fixes

- up the limit: remove all mentions of 7.60 or earlier from manpage
7.60 is 6 years old now.
- warn on "broken" added in lines, as they avoid detection

managen: "added in" fixes

- up the limit: remove all mentions of 7.60 or earlier from manpage
7.60 is 6 years old now.
- warn on "broken" added in lines, as they avoid detection
- fixup added in markup in a few curldown files

Closes #14002

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cmdline-opts: language cleanups

Use imperative mood consistently for the first sentence describing an
option.

"Set this" instead "tell curl to set" or "this sets..."

Pl

cmdline-opts: language cleanups

Use imperative mood consistently for the first sentence describing an
option.

"Set this" instead "tell curl to set" or "this sets..."

Plus some extra cleanups and rephrasing.

Closes #13106

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cmdline-docs: quote and angle bracket cleanup

- make sure angle brackets are escaped
- remove a lot of superfluous double quotes
- replace several double quotes with backticks

cmdline-docs: quote and angle bracket cleanup

- make sure angle brackets are escaped
- remove a lot of superfluous double quotes
- replace several double quotes with backticks

To make nicer-looking markdown.

Closes #12884

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docs/cmdline: change to .md for cmdline docs

- switch all invidual files documenting command line options into .md,
as the documentation is now markdown-looking.

- made the

docs/cmdline: change to .md for cmdline docs

- switch all invidual files documenting command line options into .md,
as the documentation is now markdown-looking.

- made the parser treat 4-space indents as quotes

- switch to building the curl.1 manpage using the "mainpage.idx" file,
which lists the files to include to generate it, instead of using the
previous page-footer/headers. Also, those files are now also .md
ones, using the same format. I gave them underscore prefixes to make
them sort separately:
_NAME.md, _SYNOPSIS.md, _DESCRIPTION.md, _URL.md, _GLOBBING.md,
_VARIABLES.md, _OUTPUT.md, _PROTOCOLS.md, _PROGRESS.md, _VERSION.md,
_OPTIONS.md, _FILES.md, _ENVIRONMENT.md, _PROXYPREFIX.md,
_EXITCODES.md, _BUGS.md, _AUTHORS.md, _WWW.md, _SEEALSO.md

- updated test cases accordingly

Closes #12751

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