[Editorial] Fix various typos and missing punctuation in multiple code synopses

[guyutongxue]

This PR addresses several minor editorial issues within code synopses across multiple files. These discrepancies were identified by running a custom recursive descent parser designed to extract symbols from synopsis blocks against the C++ grammar.

Summary of changes:

The fixes are purely editorial and do not change any normative meaning.

• algorithms.tex:
  • Added missing semicolon to fill_n.
  • Fixed unclosed projected_value_t template arguments.
• numerics.tex:
  • Added missing commas in parameter lists for hypot, fma, and lerp overloads.
  • Removed a redundant > in template head of basic_mask.
  • Corrected the placement of the closing @ for \exposid{array-size} in round_consts.
• ranges.tex: Added missing semicolon to a constructor definition of filter_view::sentinel.
• exec.tex: Added a missing opening brace { for function definition of basic-receiver::set_stopped.
• containers.tex: Fixed unclosed less template arguments.
• threads.tex:
  • Corrected a misplaced t: floating-poin-type -> floating-point-type.
  • Fixed unclosed chrono::time_point template arguments.

[Copilot]

Pull request overview

This PR makes editorial fixes to C++ standard “synopsis” code blocks to correct punctuation/markup issues identified by a parser, without changing normative meaning.

Changes:

• Fixes typos and missing punctuation (e.g., semicolons, commas) in multiple synopsis declarations.
• Repairs malformed template arguments / markup delimiters in several synopsis blocks.
• Fixes a missing opening brace in an exec synopsis function definition.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
source/threads.tex	Fixes a placeholder typo and repairs a malformed chrono::time_point template argument list in synopsis declarations.
source/ranges.tex	Adds a missing semicolon to a requires-clause constructor declaration in a synopsis block.
source/numerics.tex	Fixes \exposid markup placement, removes a stray > in a template head, and adds missing commas in several function parameter lists.
source/exec.tex	Adds a missing { to a synopsis function definition so the body is properly formed.
source/containers.tex	Closes an unbalanced less<...> template argument list in a deduction guide.
source/algorithms.tex	Adds a missing semicolon to fill_n and closes projected_value_t<...> template arguments in a synopsis template head.

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