fix(docs): add -fL flags to BSD/Android install curl commands

The BSD and Android install instructions used  without the
-f and -L flags, and piped to  instead of . This is
inconsistent with the Linux, macOS, and Windows sections which use
.

- -f makes curl fail on HTTP errors (4xx/5xx) instead of silently
  downloading error pages
- -L follows redirects, which may be needed for GitHub raw URLs
- The install script is POSIX-compatible (#!/bin/sh), so piping to
  sh is correct and more portable than bash (some BSD systems don't
  have bash installed by default)

README.md

@@ -189,7 +189,7 @@ zoxide can be installed in 4 easy steps:
    > Or, run this command in your terminal:
    >
    > ```sh
-   > curl -sS https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/install.sh | bash
+   > curl -sSfL https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/install.sh | sh
    > ```
 
    </details>
@@ -206,7 +206,7 @@ zoxide can be installed in 4 easy steps:
    > Or, run this command in your terminal:
    >
    > ```sh
-   > curl -sS https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/install.sh | bash
+   > curl -sSfL https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/install.sh | sh
    > ```
 
    </details>