fix imports

theories/barrier/example_client.v

 From iris.program_logic Require Export weakestpre.
 From iris.heap_lang Require Export lang.
-From iris.heap_lang.lib.barrier Require Import proof.
 From iris.heap_lang Require Import par.
 From iris.heap_lang Require Import adequacy proofmode.
+From iris_examples.barrier Require Import proof.
 Set Default Proof Using "Type".
 
 Definition worker (n : Z) : val :=

theories/barrier/example_joining_existentials.v

 From iris.program_logic Require Export weakestpre hoare.
 From iris.heap_lang Require Export lang.
 From iris.algebra Require Import excl agree csum.
-From iris.heap_lang.lib.barrier Require Import proof specification.
 From iris.heap_lang Require Import notation par proofmode.
 From iris.proofmode Require Import tactics.
+From iris_examples.barrier Require Import proof specification.
 Set Default Proof Using "Type".
 
 Definition one_shotR (Σ : gFunctors) (F : cFunctor) :=

theories/barrier/proof.v

 From iris.program_logic Require Export weakestpre.
 From iris.heap_lang Require Export lang.
-From iris.heap_lang.lib.barrier Require Export barrier.
 From stdpp Require Import functions.
 From iris.base_logic Require Import big_op lib.saved_prop lib.sts.
 From iris.heap_lang Require Import proofmode.
-From iris.heap_lang.lib.barrier Require Import protocol.
+From iris_examples.barrier Require Export barrier.
+From iris_examples.barrier Require Import protocol.
 Set Default Proof Using "Type".
 
 (** The CMRAs/functors we need. *)

theories/barrier/specification.v

 From iris.program_logic Require Export hoare.
-From iris.heap_lang.lib.barrier Require Export barrier.
-From iris.heap_lang.lib.barrier Require Import proof.
 From iris.heap_lang Require Import proofmode.
+From iris_examples.barrier Require Export barrier.
+From iris_examples.barrier Require Import proof.
 Set Default Proof Using "Type".
 Import uPred.