update docs

PiperOrigin-RevId: 812697066

docs/encode.h.3

diff --git a/docs/encode.h.3 b/docs/encode.h.3
index eea97d9..49173aa 100644
--- a/docs/encode.h.3
+++ b/docs/encode.h.3
@@ -535,6 +535,11 @@
 .PP
 Prepares a shared dictionary from the given file format for the encoder\&. \fCalloc_func\fP and \fCfree_func\fP \fBMUST\fP be both zero or both non-zero\&. In the case they are both zero, default memory allocators are used\&. \fCopaque\fP is passed to \fCalloc_func\fP and \fCfree_func\fP when they are called\&. \fCfree_func\fP has to return without doing anything when asked to free a NULL pointer\&.
 .PP
+\fBWarning:\fP
+.RS 4
+Created instance is 'lean'; it does not contain copy of \fCdata\fP, rather it contains only pointer to it; therefore, \fCdata\fP \fBMUST\fP outlive the created instance\&.
+.RE
+.PP
 \fBParameters:\fP
 .RS 4
 \fItype\fP type of dictionary stored in data