docs: typo [skip ci] (#414)

'Is' typed twice

diff --git a/docs/introduction.md b/docs/introduction.md
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--- a/docs/introduction.md
+++ b/docs/introduction.md
@@ -37,7 +37,7 @@ export default {
 
 ## Why _Pinia_
 
-Pinia (pronounced like `/peenya/` in English) is is the closest word to _piña_ (_pineapple_ in Spanish) that is a valid package name. A pineapple is in reality a group of individual flowers that join together to create a multiple fruit. Similar to stores, each one is born individually, but they are all connected at the end. It's also a delicious tropical fruit indigenous to South America.
+Pinia (pronounced like `/peenya/` in English) is the closest word to _piña_ (_pineapple_ in Spanish) that is a valid package name. A pineapple is in reality a group of individual flowers that join together to create a multiple fruit. Similar to stores, each one is born individually, but they are all connected at the end. It's also a delicious tropical fruit indigenous to South America.
 
 ## A more realistic example