[text-auditor] Batch fix clear untracked grammar issues in benchmark and parser user text

## Text Improvements

The following user-facing text issues were found in the repository. Each is a low-effort fix.

### 1. Subject/number grammar error in benchmark report docs

**File:** `docs/extend/elastic-package.md` (line 259)
**Current text:** `These report will be generated by comparing local benchmark results against ones from another benchmark run.`
**Suggested fix:** `This report will be generated by comparing local benchmark results against those from another benchmark run.`
**Why:** Clear grammatical error (`These report`), and a small wording cleanup keeps meaning unchanged.

### 2. Grammar error in Thycotic parser troubleshooting steps

**File:** `packages/thycotic_ss/docs/README.md` (line 67)
**Current text:** `Delete the \`message\` field that it original parsed (normal behaviour?)`
**Suggested fix:** `Delete the \`message\` field that it originally parsed (normal behavior?)`
**Why:** Clear grammar/word-form error (`original` → `originally`).

### 3. Typo in Thycotic parser troubleshooting steps

**File:** `packages/thycotic_ss/docs/README.md` (line 68)
**Current text:** `...because it errored when tring to parse them`
**Suggested fix:** `...because it errored when trying to parse them`
**Why:** Clear spelling typo (`tring` → `trying`).

### 4. Unnatural runtime message wording in Buildkite script

**File:** `.buildkite/scripts/common.sh` (line 70)
**Current text:** `The current platform/OS type is unsupported yet`
**Suggested fix:** `The current platform/OS type is not supported yet`
**Why:** Clear grammar issue in user-visible CI output (`unsupported yet` is awkward/ungrammatical).

## Suggested Actions

- [ ] Update the benchmark report sentence in `docs/extend/elastic-package.md` line 259.
- [ ] Fix `original` → `originally` in `packages/thycotic_ss/docs/README.md` line 67.
- [ ] Fix `tring` → `trying` in `packages/thycotic_ss/docs/README.md` line 68.
- [ ] Replace `unsupported yet` with `not supported yet` in `.buildkite/scripts/common.sh` line 70.

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[What is this?](https://ela.st/github-ai-tools) | [From workflow: Text Auditor](https://github.com/elastic/integrations/actions/runs/26284009376)

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