[DOC] Fix typos

Inspired by 42ba824, I looked for other
occurrences of "the the".

Author: etiennebarrie

error.c

@@ -1686,7 +1686,7 @@ check_order_keyword(VALUE opt)
  *   - If the value of keyword +order+ is +:top+ (the default),
  *     lists the error message and the innermost backtrace entry first.
  *   - If the value of keyword +order+ is +:bottom+,
- *     lists the error message the the innermost entry last.
+ *     lists the error message the innermost entry last.
  *
  * Example:
  *

internal/io.h

@@ -132,7 +132,7 @@ struct rb_io {
     struct rb_execution_context_struct *closing_ec;
     VALUE wakeup_mutex;
 
-    // The fork generation of the the blocking operations list.
+    // The fork generation of the blocking operations list.
     rb_serial_t fork_generation;
 };
 

zjit/src/asm/arm64/mod.rs

@@ -18,7 +18,7 @@ pub use arg::*;
 pub use opnd::*;
 
 /// The extend type for register operands in extended register instructions.
-/// It's the reuslt size is determined by the the destination register and
+/// It's the result size is determined by the destination register and
 /// the source size interpreted using the last letter.
 #[derive(Clone, Copy)]
 pub enum ExtendType {