switching to nightly for intra-doc links

[realaravinth]

PR Type

Bug Fix

Overview

This PR changes upload-doc Github workflow to use nightly Rust tool chain. nightly is required to migrate to intra-doc links.

@robjtede pointed out that intra-doc links are already in use in some parts of the code base but with the usage of stable, we have broken links in master API documentation.

Please see #1781 for more details.

[codecov]

Codecov Report

Merging #1783 (cf0dc07) into master (9b42333) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1783      +/-   ##
==========================================
- Coverage   53.82%   53.79%   -0.04%     
==========================================
  Files         129      128       -1     
  Lines       12193    12201       +8     
==========================================
  Hits         6563     6563              
- Misses       5630     5638       +8     

Impacted Files	Coverage Δ
actix-http/src/header/common/mod.rs	7.69% <0.00%> (-2.31%)	⬇️
actix-http/src/header/common/etag.rs
actix-http/src/header/common/content_language.rs
actix-http/src/header/common/if_match.rs
actix-http/src/header/common/accept_charset.rs
actix-http/src/header/common/allow.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/if_none_match.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/expires.rs	0.00% <0.00%> (ø)

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