typos, polishing needed

See #126, release log:

• a4cda34 by @yegor256: #126: Refactor inline $\varphi...
• fe03aa4 by @yegor256: #126: Refactor variable names ...
• 303b75b by @yegor256: #126: Fix logic error in handl...
• 8733235 by @yegor256: #126: Fix parsing of "T" symbo...
• 34097f2 by @yegor256: Merge pull request #123 from o...
• e90f17c by @yegor256: Merge pull request #124 from o...
• da0493c by @yegor256: Merge pull request #125 from o...
• c1221e9 by @yegor256: Refactor x(a,b,c) method in eo...
• b540db6 by @renovate[bot]: Update JamesIves/github-pages-...
• cc687bb by @renovate[bot]: Update DavidAnson/markdownlint...
• 1b8e4b7 by @renovate[bot]: Update crate-ci/typos action t...

Released by Rultor 2.0-SNAPSHOT, see build log