docs: fix broken links

.github/PULL_REQUEST_TEMPLATE.md

@@ -29,7 +29,7 @@ write a little note why.
 - [ ] Appropriate labels applied
 - [ ] Targeted PR against correct branch
 - [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
-- [ ] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
+- [ ] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/v0.45.3/docs/building-modules/README.md).
 - [ ] Wrote unit and integration
 - [ ] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
 - [ ] Added relevant `godoc` [comments](https://go.dev/blog/godoc).

x/farming/spec/01_concepts.md

@@ -48,7 +48,7 @@ In the farming module, farming rewards are calculated per epoch based on the dis
 
 To calculate the rewards for a single farmer, take the total rewards for the epoch before the staking started, minus the current total rewards. 
 
-The farming module takes references from [F1 Fee Distribution](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/fee_distribution/f1_fee_distr.pdf) that is used in the Cosmos SDK [x/distribution](https://github.com/cosmos/cosmos-sdk/blob/master/x/distribution/spec/01_concepts.md) module.
+The farming module takes references from [F1 Fee Distribution](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/fee_distribution/f1_fee_distr.pdf) that is used in the Cosmos SDK [x/distribution](https://github.com/cosmos/cosmos-sdk/blob/v0.45.3/x/distribution/spec/01_concepts.md) module.
 
 ### Accumulated Unit Reward 
 

x/farming/spec/04_messages.md

@@ -72,7 +72,7 @@ type MsgStake struct {
 
 A farmer must have some staking coins to trigger this message.
 
-In contrast to the Cosmos SDK [staking](https://github.com/cosmos/cosmos-sdk/blob/master/x/staking/spec/01_state.md) module, there is no concept of an unbonding period where some time is required to unstake coins. 
+In contrast to the Cosmos SDK [staking](https://github.com/cosmos/cosmos-sdk/blob/v0.45.3/x/staking/spec/01_state.md) module, there is no concept of an unbonding period where some time is required to unstake coins. 
 
 All of the accumulated farming rewards are automatically withdrawn to the farmer after an unstaking event is triggered.
 
@@ -86,7 +86,7 @@ type MsgUnstake struct {
 ## MsgHarvest
 
 The farming rewards are automatically accumulated, but they are not automatically distributed. 
-A farmer must harvest their farming rewards. This mechanism is similar to the Cosmos SDK [distribution](https://github.com/cosmos/cosmos-sdk/blob/master/x/distribution/spec/01_concepts.md) module.
+A farmer must harvest their farming rewards. This mechanism is similar to the Cosmos SDK [distribution](https://github.com/cosmos/cosmos-sdk/blob/v0.45.3/x/distribution/spec/01_concepts.md) module.
 Also, if there is `UnharvestedRewards`, unharvested rewards are also withdrawn and the object is deleted.
 
 ```go