Update flow_control.md (#1591)

Fixed a typo and changed `essential` to `integral`.
rust-lang · Aug 10, 2022 · 73350e7 · 73350e7
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commit 73350e7
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diff --git a/src/flow_control.md b/src/flow_control.md
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 # Flow of Control
 
-An essential part of any programming languages are ways to modify control flow:
+An integral part of any programming language are ways to modify control flow:
 `if`/`else`, `for`, and others. Let's talk about them in Rust.