Xeriscape was flagged as a spelling error

**What got flagged?**
Xeriscape -> Periscope

**Why is this incorrect?**
[Xeriscape](https://www.merriam-webster.com/dictionary/xeriscape) - A landscaping method developed especially for arid and semiarid climates that utilizes water-conserving techniques

**Example of correct usage:**
Landscape architects have been working to address the growing water crisis with such techniques as xeriscape.
Thus, once a xeriscape is established, one has to spend a lot less time keeping it up.

No file or test is named. Start by reproducing the spelling warning for “xeriscape” and locating the spelling-word data or entry point that produces the suggestion “Periscope.” Done means the checker accepts “xeriscape” as a valid word without replacing or flagging it, with a regression check if the project has an existing spelling-test location.

Written by the indexing model from the issue text.