Readme fixes and improvements (#448)

Signed-off-by: João Pereira <484633+joaodrp@users.noreply.github.com>

README.md

@@ -126,13 +126,10 @@ The following checks were performed on these signatures:
 OCI registries are useful for storing more than just container images!
 `Cosign` also includes some utilities for publishing generic artifacts, including binaries, scripts, and configuration files using the OCI protocol.
 
-### Blobs
-
-OCI registries are useful for storing more than just container images!
-`Cosign` also includes some utilities for publishing generic artifacts, including binaries, scripts, and configuration files using the OCI protocol.
-
 This section shows how to leverage these for an easy-to-use, backwards-compatible artifact distribution system that integrates well with the rest of Sigstore.
 
+### Blobs
+
 You can publish an artifact with `cosign upload blob`:
 
 ```shell
@@ -196,11 +193,11 @@ The signature, claims and transparency log proofs are all verified automatically
 
 #### Tekton Bundles
 
-(Tekton)[https://tekton.dev] bundles can be uploaded and managed within an OCI registry.
-The specification is [here]https://tekton.dev/docs/pipelines/tekton-bundle-contracts/.
+[Tekton](https://tekton.dev) bundles can be uploaded and managed within an OCI registry.
+The specification is [here](https://tekton.dev/docs/pipelines/tekton-bundle-contracts/).
 This means they can also be signed and verified with `cosign`.
 
-Tekon Bundles can curently be uploaded with the [tkn cli](github.com/tekton/cli), but we may add this support to
+Tekton Bundles can currently be uploaded with the [tkn cli](github.com/tekton/cli), but we may add this support to
 `cosign` in the future.
 
 ```shell
@@ -250,7 +247,7 @@ Today, `cosign` has been tested and works against the following registries:
 * Azure Container Registry
 * JFrog Artifactory Container Registry
 * The CNCF distribution/distribution Registry
-* Gitlab Container Registry
+* GitLab Container Registry
 * GitHub Container Registry
 * The CNCF Harbor Registry
 * Digital Ocean Container Registry
@@ -325,7 +322,7 @@ That looks like:
 **Note:** This can be generated for an image reference using `cosign generate <image>`.
 
 I'm happy to switch this format to something else if it makes sense.
-See [https://github.com/notaryproject/nv2/issues/40] for one option.
+See https://github.com/notaryproject/nv2/issues/40 for one option.
 
 
 #### Registry Details
@@ -338,7 +335,7 @@ Similarly, they **can** easily be copied from one environment to another, but th
 automatic.
 
 Multiple signatures are stored in a list which is unfortunately "racy" today.
-To add a signtaure, clients orchestrate a "read-append-write" operation, so the last write
+To add a signature, clients orchestrate a "read-append-write" operation, so the last write
 will win in the case of contention.
 
 ##### Specifying Registry
@@ -407,8 +404,6 @@ Right now cosign supports Hashicorp Vault, AWS KMS, and GCP KMS, and we are hopi
 
 See the [KMS docs](KMS.md) for more details.
 
-```
-
 ### OCI Artifacts
 
 Push an artifact to a registry using [oras](https://github.com/deislabs/oras) (in this case, `cosign` itself!):
@@ -630,17 +625,23 @@ $ cosign verify -key cosign.pub dlorenc/demo | jq .
     "sig": "original"
   }
 }
+```
 
-# Now give that signature a memorable name, then sign that
+Now give that signature a memorable name, then sign that:
+
+```shell
 $ crane tag $(cosign triangulate dlorenc/demo) mysignature
 2021/02/15 20:22:55 dlorenc/demo:mysignature: digest: sha256:71f70e5d29bde87f988740665257c35b1c6f52dafa20fab4ba16b3b1f4c6ba0e size: 556
 $ cosign sign -key cosign.key -a sig=counter dlorenc/demo:mysignature
 Enter password for private key:
 Pushing signature to: dlorenc/demo:sha256-71f70e5d29bde87f988740665257c35b1c6f52dafa20fab4ba16b3b1f4c6ba0e.sig
 $ cosign verify -key cosign.pub dlorenc/demo:mysignature
 {"Critical":{"Identity":{"docker-reference":""},"Image":{"Docker-manifest-digest":"71f70e5d29bde87f988740665257c35b1c6f52dafa20fab4ba16b3b1f4c6ba0e"},"Type":"cosign container image signature"},"Optional":{"sig":"counter"}}
+```
+
+Finally, check the original signature:
 
-# Finally, check the original signature
+```shell
 $ crane manifest dlorenc/demo@sha256:71f70e5d29bde87f988740665257c35b1c6f52dafa20fab4ba16b3b1f4c6ba0e
 {
   "schemaVersion": 2,