Add headers to all markdown files

src/content/developers/tutorials/logging-events-smart-contracts/index.md

@@ -12,9 +12,11 @@ sourceUrl: https://ethereumdev.io/logging-data-with-events/
 address: "0x19dE91Af973F404EDF5B4c093983a7c6E3EC8ccE"
 ---
 
-In Solidity, [events](/developers/docs/smart-contracts/anatomy/#events-and-logs) are dispatched signals the smart contracts can fire. DApps, or anything connected to Ethereum JSON-RPC API, can listen to these events and act accordingly. Event can also be indexed, so that the event history is searchable later.
+In Solidity, [events](/developers/docs/smart-contracts/anatomy/#events-and-logs) are dispatched signals the smart contracts can fire. DApps, or anything connected to Ethereum JSON-RPC API, can listen to these events and act accordingly. An event can also be indexed so that the event history is searchable later.
 
-The most common event on the Ethereum blockchain at the time of writing this article is the Transfer event that is emitted by ERC20 tokens when someone transfer tokens.
+## Events {#events}
+
+The most common event on the Ethereum blockchain at the time of writing this article is the Transfer event that is emitted by ERC20 tokens when someone transfers tokens.
 
 ```solidity
 event Transfer(address indexed from, address indexed to, uint256 value);

src/content/translations/pl/developers/tutorials/logging-events-smart-contracts/index.md

@@ -18,6 +18,8 @@ address: "0x19dE91Af973F404EDF5B4c093983a7c6E3EC8ccE"
 
 W Solidity [zdarzenia](/developers/docs/smart-contracts/anatomy/#events-and-logs) to wysyłane sygnały, które mogą uruchamiać inteligentne kontrakty. Aplikacje zdecentralizowane lub wszystko, co jest połączone z interfejsem API Ethereum JSON-RPC, może nasłuchiwać tych zdarzeń i odpowiednio działać. Zdarzenie można również zindeksować, aby później można było przeszukiwać historię zdarzeń.
 
+## Zdarzeniami {#events}
+
 Najczęstszym zdarzeniem na blockchainie Ethereum w momencie pisania tego artykułu jest zdarzenie Transfer, które jest emitowane przez tokeny ERC20, gdy ktoś przenosi tokeny.
 
 ```solidity

src/content/translations/ro/developers/tutorials/logging-events-smart-contracts/index.md

@@ -14,6 +14,8 @@ address: "0x19dE91Af973F404EDF5B4c093983a7c6E3EC8ccE"
 
 În Solidity, [evenimentele](/developers/docs/smart-contracts/anatomy/#events-and-logs) sunt semnalele expediate pe care contractele inteligente le pot declanșa. Aplicațiile dapp sau orice conectat la Ethereum JSON-RPC API, pot asculta aceste evenimente și pot acționa în consecință. De asemenea, evenimentul poate fi indexat, pentru ca istoricul evenimentelor să poată fi căutat mai târziu.
 
+## Evenimente {#events}
+
 Cel mai comun eveniment pe Ethereum blockchain la momentul scrierii acestui articol este evenimentul de transfer, care este emis de tokenuri ERC20 atunci când cineva transferă tokenuri.
 
 ```solidity

src/content/translations/zh/developers/tutorials/logging-events-smart-contracts/index.md

@@ -18,6 +18,8 @@ address: "0x19dE91Af973F404EDF5B4c093983a7c6E3EC8ccE"
 
 在 solidity 中，[事件](/developers/docs/smart-contracts/anatomy/#events-and-logs)是智能合约可触发的调度信号。 去中心化应用或其他任何连接到以太坊 JSON-PRC API 的程序，都可以监听这些事件，并执行相应操作。 可以建立事件的索引，以便稍后可以搜索到事件历史记录。
 
+## 事件 {#events}
+
 在撰写这篇文章之时，以太坊区块链上最常见的事件是由 ERC20 代币转账时触发的 Transfer 事件。
 
 ```solidity