docs(api): fix typo

'Than' was used in a few places instead of 'then'.

docs/api.md

@@ -928,9 +928,9 @@ This is a shortcut for [page.mainFrame().url()](#frameurl)
 - returns: <[Promise]>
 
 This method behaves differently with respect to the type of the first parameter:
-- if `selectorOrFunctionOrTimeout` is a `string`, than the first argument is treated as a [selector] to wait for and the method is a shortcut for [page.waitForSelector](#pagewaitforselectorselector-options)
-- if `selectorOrFunctionOrTimeout` is a `function`, than the first argument is treated as a predicate to wait for and the method is a shortcut for [page.waitForFunction()](#pagewaitforfunctionpagefunction-options-args).
-- if `selectorOrFunctionOrTimeout` is a `number`, than the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
+- if `selectorOrFunctionOrTimeout` is a `string`, then the first argument is treated as a [selector] to wait for and the method is a shortcut for [page.waitForSelector](#pagewaitforselectorselector-options)
+- if `selectorOrFunctionOrTimeout` is a `function`, then the first argument is treated as a predicate to wait for and the method is a shortcut for [page.waitForFunction()](#pagewaitforfunctionpagefunction-options-args).
+- if `selectorOrFunctionOrTimeout` is a `number`, then the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
 - otherwise, an exception is thrown
 
 Shortcut for [page.mainFrame().waitFor(selectorOrFunctionOrTimeout[, options[, ...args]])](#framewaitforselectororfunctionortimeout-options-args).
@@ -1331,9 +1331,9 @@ Returns frame's url.
 - returns: <[Promise]>
 
 This method behaves differently with respect to the type of the first parameter:
-- if `selectorOrFunctionOrTimeout` is a `string`, than the first argument is treated as a [selector] to wait for and the method is a shortcut for [frame.waitForSelector](#framewaitforselectorselector-options)
-- if `selectorOrFunctionOrTimeout` is a `function`, than the first argument is treated as a predicate to wait for and the method is a shortcut for [frame.waitForFunction()](#framewaitforfunctionpagefunction-options-args).
-- if `selectorOrFunctionOrTimeout` is a `number`, than the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
+- if `selectorOrFunctionOrTimeout` is a `string`, then the first argument is treated as a [selector] to wait for and the method is a shortcut for [frame.waitForSelector](#framewaitforselectorselector-options)
+- if `selectorOrFunctionOrTimeout` is a `function`, then the first argument is treated as a predicate to wait for and the method is a shortcut for [frame.waitForFunction()](#framewaitforfunctionpagefunction-options-args).
+- if `selectorOrFunctionOrTimeout` is a `number`, then the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
 - otherwise, an exception is thrown