typo fixes (#1983)

"standard also bring" -> "standard also brings"
"killer feature are" -> "killer feature is"

docs/modules/ROOT/pages/tokens.adoc

@@ -175,7 +175,7 @@ As a result, a multitude of new token standards were and are still being develop
 
 Like ERC20, ERC777 is a standard for <<different-kinds-of-tokens,_fungible_ tokens>>, and is focused around allowing more complex interactions when trading tokens. More generally, it brings tokens and Ether closer together by providing the equivalent of a `msg.value` field, but for tokens.
 
-The standard also bring multiple quality-of-life improvements, such as getting rid of the confusion around `decimals`, minting and burning with proper events, among others, but its killer feature are *receive hooks*. A hook is simply a function in a contract that is called when tokens are sent to it, meaning *accounts and contracts can react to receiving tokens*.
+The standard also brings multiple quality-of-life improvements, such as getting rid of the confusion around `decimals`, minting and burning with proper events, among others, but its killer feature is *receive hooks*. A hook is simply a function in a contract that is called when tokens are sent to it, meaning *accounts and contracts can react to receiving tokens*.
 
 This enables a lot of interesting use cases, including atomic purchases using tokens (no need to do `approve` and `transferFrom` in two separate transactions), rejecting reception of tokens (by reverting on the hook call), redirecting the received tokens to other addresses (similarly to how xref:api:payment#PaymentSplitter[`PaymentSplitter`] does it), among many others.