Document supported pseudocode with section 7 language manuals

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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+% CPSC-KEYWORD-WHILE(7)
+
+# NAME
+
+cpsc-keyword-while - repeat while a condition is true
+
+# SYNOPSIS
+
+```text
+WHILE condition DO
+    statements
+ENDWHILE
+```
+
+# DESCRIPTION
+
+Test before each iteration; the body may run zero times.
+DO and ENDWHILE belong to this syntax.
+
+# EXAMPLE
+
+```text
+DECLARE Count : INTEGER
+Count <- 1
+WHILE Count <= 3 DO
+    OUTPUT Count
+    Count <- Count + 1
+ENDWHILE
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-repeat(7)](cpsc-keyword-repeat.7.md), [cpsc-keyword-for(7)](cpsc-keyword-for.7.md).
+