cc docs: fix some Doxygen errors

commit_hash:e5ace0041125ec3bc88c852afbe505e353d43422

Author: Anton3

core/include/userver/dump/meta_containers.hpp

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include <userver/dump/meta.hpp>
+#include <userver/utils/meta.hpp>
 
 USERVER_NAMESPACE_BEGIN
 

core/include/userver/logging/component.hpp

@@ -54,9 +54,9 @@ namespace components {
 ///
 /// ### Logs output
 /// You can specify where logs are written in the `file_path` option:
-/// - Use <tt>file_path: '@stdout'</tt> to write your logs to standard output stream;
-/// - Use <tt>file_path: '@stderr'</tt> to write your logs to standard error stream;
-/// - Use <tt>file_path: '@null'</tt> to suppress sending of logs;
+/// - Use <tt>file_path: '\@stdout'</tt> to write your logs to standard output stream;
+/// - Use <tt>file_path: '\@stderr'</tt> to write your logs to standard error stream;
+/// - Use <tt>file_path: '\@null'</tt> to suppress sending of logs;
 /// - Use <tt>file_path: /absolute/path/to/log/file.log</tt> to write your logs to file. Use USR1 signal or @ref server::handlers::OnLogRotate to reopen files after log rotation;
 /// - Use <tt>file_path: 'unix:/absolute/path/to/logs.sock'</tt> to write your logs to unix socket. Socket must be created before the service starts and closed by listener after service is shut down.
 ///

kafka/include/userver/kafka/rebalance_types.hpp

@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <functional>
+#include <optional>
 
 #include <userver/utils/span.hpp>
 #include <userver/utils/zstring_view.hpp>

universal/include/userver/utils/encoding/hex.hpp

@@ -47,7 +47,7 @@ constexpr size_t FromHexUpperBound(size_t size) noexcept {
 void ToHex(std::string_view input, std::string& out) noexcept;
 
 /// @brief Converts input to hex and writes data to output @p out.
-/// @warning `out` must be pre-allocated to at least @ref LengthInHexForm bytes.
+/// @warning `out` must be pre-allocated to at least @ref utils::encoding::LengthInHexForm bytes.
 /// @param input bytes to convert
 /// @param out buffer to write data
 void ToHexBuffer(std::string_view input, utils::span<char> out) noexcept;

universal/utest/include/userver/utest/literals.hpp

@@ -1,4 +1,10 @@
 #pragma once
 
+USERVER_NAMESPACE_BEGIN
+
+namespace formats::literals {}
+
+USERVER_NAMESPACE_END
+
 // NOLINTNEXTLINE(google-build-using-namespace, google-global-names-in-headers)
 using namespace USERVER_NAMESPACE::formats::literals;