Installation guide - replace curly bracket with parantheses

[smollerNV]

To correctly set the path for the environment variable, the pwk command must be enclosed in parantheses rather than curly brackets.

Type of change

• Documentation update

[greptile-apps]

Greptile Summary

This PR fixes a bash syntax bug in the source installation guide. The export ISAACSIM_PATH line previously used "${pwd}/_build/linux-x86_64/release", which performs variable expansion on a variable named pwd (which is empty by default), resulting in a broken path. The fix correctly uses "$(pwd)/_build/linux-x86_64/release", which performs command substitution — executing the pwd command to obtain the current working directory.

• Fixes ${pwd} → $(pwd) on the ISAACSIM_PATH export line in the Linux tab of the installation guide
• The Windows equivalent (%cd%) in the same file was already correct and is unchanged
• The fix is accurate and matches the intended behavior described in the PR

Confidence Score: 5/5

• This PR is safe to merge — it is a correct, minimal documentation fix with no risk.
• The change is a single-line correction of a bash syntax error in a .rst documentation file. It introduces no logic changes, no new dependencies, and the fix ($(pwd) vs ${pwd}) is unambiguously correct for bash command substitution.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/source/setup/installation/source_installation.rst	Corrects bash command substitution syntax from ${pwd} (variable expansion) to $(pwd) (command substitution) when setting ISAACSIM_PATH.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["User runs: export ISAACSIM_PATH=..."] --> B{Syntax used}
    B -- "Before: \${pwd}" --> C["Shell looks up variable 'pwd'\n(empty string by default)"]
    C --> D["ISAACSIM_PATH = '/_build/linux-x86_64/release'\n❌ Broken path"]
    B -- "After: \$(pwd)" --> E["Shell executes 'pwd' command\nreturns current directory"]
    E --> F["ISAACSIM_PATH = '/home/user/isaac-sim/_build/linux-x86_64/release'\n✅ Correct path"]

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_{Last reviewed commit: bc41ffc}

[myurasov-nv]

@smollerNV I think it makes more sense to add this to develop branch.