Fix miscellaneous typos

[wltan]

Fixes #52

[canihasreview[bot]]

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[canihasreview[bot]]

v1

@wltan submitted v1 for review.

• [v1 1/1] Fix miscellaneous typos

(:books: Archive)

Checkout this PR version locally

```sh git fetch https://github.com/se-edu/addressbook-level3.git refs/pr/65/1/head:BRANCHNAME ``` where `BRANCHNAME` is the name of the local branch you wish to fetch this PR to.

[codecov-io]

Codecov Report

Merging #65 (ba35277) into master (fb67d1f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage     72.18%   72.18%           
  Complexity      401      401           
=========================================
  Files            70       70           
  Lines          1233     1233           
  Branches        126      126           
=========================================
  Hits            890      890           
  Misses          311      311           
  Partials         32       32           

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[damithc]

@wltan

1. As these are two different fixes, I think the PR should be split into two commits.
2. The change to the activity diagram also requires an updated png file? (@j-lum correct me if wrong).

[wltan]

1. As these are two different fixes, I think the PR should be split into two commits.

Ok, I've split the changes over two commits, each with a simple message body as well.

2. The change to the activity diagram also requires an updated png file?

I've already created and pushed a new png for the updated diagram. Do any further changes need to be made?

[damithc]

@wltan if ready for review, you can use the bot to submit a new version (use the same link as before).

[canihasreview[bot]]

v2

@wltan submitted v2 for review.

• [v2 1/2] Fix typo in CommitActivityDiagram
• [v2 2/2] Fix typo in Add Remark Tutorial

(:books: Archive) (:chart_with_upwards_trend: Interdiff between v1 and v2) (:chart_with_upwards_trend: Range-Diff between v1 and v2)

Checkout this PR version locally

```sh git fetch https://github.com/se-edu/addressbook-level3.git refs/pr/65/2/head:BRANCHNAME ``` where `BRANCHNAME` is the name of the local branch you wish to fetch this PR to.

[canihasreview[bot]]

v3

@wltan submitted v3 for review.

• [v3 1/2] CommitActivityDiagram.puml: Fix typo redunant -> redundant
• [v3 2/2] AddRemark.md: Fix typo an -> a

(:books: Archive) (:chart_with_upwards_trend: Interdiff between v2 and v3) (:chart_with_upwards_trend: Range-Diff between v2 and v3)

Checkout this PR version locally

```sh git fetch https://github.com/se-edu/addressbook-level3.git refs/pr/65/3/head:BRANCHNAME ``` where `BRANCHNAME` is the name of the local branch you wish to fetch this PR to.

[damithc]

Thanks for the fixes @wltan